Develop Bugs

[Q] Is it possible to Enable 850 & 1900 UTMS Freq on I8150?

Hi everyone!
does anyone know if it is possible to enable 850 & 1900 Frequency bands on the I8150? if yes, please, please, some leads for the procedure (Root, or Custom ROM or whatever it makes it work!) i´m not an expert unfortunately.
Just bought an I8150 in Malasya 900/2100 Band which does not work in my country 850/1900 (my fault, didn´t check) so i´m at present using my I8150 as an expensive 2G with a fancy Calendar!.
Thanks lot for any help!!

Hi
First, this is possible, using Samsung Service Mode.......
easiest way to do it is with this App:
https://market.android.com/details?id=com.nfye.insanity.toolbox&hl=en
It has option to enable bands in Secret Codes:
Band Selection.....
Also, read here, but for i9000, so careful:
http://androidforums.com/samsung-ga...rk-frequency-your-samsung-i9000-galaxy-s.html

Hi,
If you don't want to install nitrality (because it needs a rooted phone), you can always dial the band selection service mode directly: *#2263#

For some reason, nitrality does not work on the phone.
The band selection I´ve already tried but no asteriscks appear, selected the options anyway, but nothing happens (even after rebooting).
Thanks anyway, if you have any other comments let me know, you never know..

Hold on there!
this may sound extreeemely roocky (which in fact is) but,
do i need to have the phone rooted so when i dial the band selection in service mode the changes take effect?????!!!
Also, now i know why Nitrality didn´t work.
So i guess i´m gonna root the phone, if you have any link to recomendable instructions let me know, otherwise i´ll look over the net.
Thanks, hope this is the clue to the whole thing

Hi all,
my questions are similar to the ones joan10 asked and thus I'll simply add them to this thread.
(1) joan10: I'm very interested in your progress. Could you please post whether you got the 850MHZ band working or not? Thanks in advance!
(2) Does Samsung ship different versions of the i8150? I'm asking since the Samsung Hongkong website explicitely states that the i8150 is a UMTS (3G) quadband device. However most resellers (and actually most websites like gsmchoice.com) here in Europe sell the phone as a dualband UMTS device.
(3) If there are different versions: How do I find out in advance if the phone I'm buying is a Quadband UMTS device? I guess that the usual sales assistants in electronic stores cannot tell me. I intend to buy the phone in Europe.
(4) Given the posts in this forum, I guess that I will have to enable all bands manually using the so called "service mode". Is there any reason why Samsung does not ship the phones with that configuration even though it is a quadband device? Are there any disadvantages if all bands are enabled?
(5) Will I have to root the device in order to enable all bands? If so, will that affect the warranty?
Thank you *very* much in advance!

Hi,
I can tell you about the experience I've had with the SGW (i8150) and 850MHz UMTS. I bought the phone from UK to try it in my country which uses GSM-1800, UMTS-850. As of today I have not been able to connect to the mobile network, even after rooting and trying different ROMs from Europe and Asia.
I also tried to selecting the 850 band from service mode, but like you mentioned, the asterisk does not show up at 850.
My phone company regularly publishes a list of the phone models that are compatible with its network, and to my surprise the SGW is listed there but with the model i8150B, firmware versions: I8150BVJKJ5 and I8150BVJKH1.
From what I have read in this forum, I suspect the i8150B is a model first launched for the Brazilian market which uses UMTS850 and UMTS2100. So i8150B probably has a different antenna design.
I've been thinking of getting a hold of an i8150B ROM and flashing it to see what happens, or perhaps I'll just give up and try to sell it.

If you do try it, plz update here with the resaults... Hope it will work!

freditoc said:
Hi,
I can tell you about the experience I've had with the SGW (i8150) and 850MHz UMTS. I bought the phone from UK to try it in my country which uses GSM-1800, UMTS-850. As of today I have not been able to connect to the mobile network, even after rooting and trying different ROMs from Europe and Asia.
I also tried to selecting the 850 band from service mode, but like you mentioned, the asterisk does not show up at 850.
My phone company regularly publishes a list of the phone models that are compatible with its network, and to my surprise the SGW is listed there but with the model i8150B, firmware versions: I8150BVJKJ5 and I8150BVJKH1.
From what I have read in this forum, I suspect the i8150B is a model first launched for the Brazilian market which uses UMTS850 and UMTS2100. So i8150B probably has a different antenna design.
I've been thinking of getting a hold of an i8150B ROM and flashing it to see what happens, or perhaps I'll just give up and try to sell it.
Click to expand...
Click to collapse
Hi freditoc....
I have the opinion that you will need a suitable, for your region, Phone i.e. Modem/Radio FW to take advantage of the Bands in your area.....
I think the phone has the radio HW OK.....but needs the proper Regional FW.
Perhaps there is a way with ODIN to flash sepetately regional Phone FW?? and keep other upgrades.....
I don't think Euro or Asian Phone FW is appropriate in America.....South/Central???
So maybe more research for ppl who bought Euro or Asia phone, but want to use in Brazil or Costa Rica, etc.
Makes sense....No or Yes??
I think this is mentioned in the I9000 thread I referred to earlier..
Sent from my GT-I8150 using Tapatalk

I have a SGH-T679 (EXHIBIT II), that I use in Europe and My local providers use 900/2100 MHz for UMTS (3G).
I can connect to any GSM network (900/1800MHz), but no 3G service because 850/1900MHz US radio.
There is no way to put the * to 900/2100MHz in the service menu only 850/1900MHz.
I think that the baseband sw is diferent and it might work for SGW and that of the SGW for the Exhibit II.
Here is the backup of My radio.bin http://www.mediafire.com/?vtbrp8ecwyxtfdx . Baseband T678UVKJ1.
Please upload some European i8150 basebands.
You can use adb and following commands
adb shell
su
dd if=/dev/block/mmcblk0p8 of=/sdcard/modem.bin bs=4096
exit
exit

arth_ur said:
I have a SGH-T679 (EXHIBIT II), that I use in Europe and My local providers use 900/2100 MHz for UMTS (3G).
I can connect to any GSM network (900/1800MHz), but no 3G service because 850/1900MHz US radio.
There is no way to put the * to 900/2100MHz in the service menu only 850/1900MHz.
I think that the baseband sw is diferent and it might work for SGW and that of the SGW for the Exhibit II.
Here is the backup of My radio.bin http://www.mediafire.com/?vtbrp8ecwyxtfdx . Baseband T678UVKJ1.
Please upload some European i8150 basebands.
You can use adb and following commands
adb shell
su
dd if=/dev/block/mmcblk0p8 of=/sdcard/modem.bin bs=4096
exit
exit
Click to expand...
Click to collapse
Hello friend arth_ur.....(Guinness??)
Please find modem.bin file from my Euro GT-I8150......dropbox link:
http://db.tt/Mt3Z526A
Phone/Baseband: I8150OXXKK1
Like you, but in reverse I can only
[*] the 900/2100 CDMA 3G Bands in Service Menu Band Selection...
Hope the file helps!!!!
Cheers
Sent from my GT-I8150 using Tapatalk

Hi all,
I'm really interested in the outcome of that discussion. However I'd have some additional questions:
(1) Wouldn't it be possible to simply read out hardware information from your devices? So that you see which UMTS module is built into your device and find out if it's quadband-capable?
(2) Can you tell me what the file 'modem.bin' acutally does? Why doesn't Samsung deliver the devices with only two bands activated?
Thanks in advance!

Sorry, there is a mistake in my last question. I wanted to ask "Why does Samsung deliver the devices with only two bands activated?"
Additionally, I want to refer to the Hong Kong website from Samsung (..samsung.com/hk_en/support/model/GT-I8150FKATGY-techspecs), which states that the phone is a quadband UMTS device. Maybe you can get the appropriate firmware from Samsung Hong Kong.
Please let me know about any progress. Thanks in advance!
Cheers!

irishpancake said:
Hello friend arth_ur.....(Guinness??)
Please find modem.bin file from my Euro GT-I8150......dropbox link:
http://db.tt/Mt3Z526A
Phone/Baseband: I8150OXXKK1
Like you, but in reverse I can only
[*] the 900/2100 CDMA 3G Bands in Service Menu Band Selection...
Hope the file helps!!!!
Cheers
Sent from my GT-I8150 using Tapatalk
Click to expand...
Click to collapse
Thank you for the file.
I have been busy lately, and I had no time to check in.
I compared the files with a hex editor, and unfortunately there are big differences...
I am afraid to softbrick my phone, so I will research on it a little further.
I tried the methods described at
http://androidforums.com/samsung-ga...rk-frequency-your-samsung-i9000-galaxy-s.html
In the service menu
* # * # 1 9 7 3 2 8 6 4 0 # * # *
If you select:
[1] Debug Screen
+
[8] Phone Control
+
[7] Network Control
+
[2] Band Selection
Unfortunately the SGH-T679 does not have combi-band options.
Key in [4] (tap [menu], than Key in), displays a hidden menu:
"[1] GSM 850
[2] GSM 900
[3] GSM 1800
[4] GSM 1900
[5] WCDMA 850
[6] WCDMA 900
[7] WCDMA 1800
[8] WCDMA 1900
[9] WCDMA 2100
If you want to add other bands
choose band that youa want again"
However it doesn't change anything regardless what you choose next.
You can also enter
*#*#info#*#* (*#*#4636#*#*)
and you tap [Phone info],
then you can "Set preferred network type:"
choices are:
WCDMA preferred
GSM only
WCDMA only
GSM auto (PRL)
CDMA auto (PRL)
CDMA only
EvDo only
GSM/CDMA auto (PRL) - default by My phone
Unknown
I tried a few options but no help.
There is also a [menu] key [Select radio band], where choices are:
Automatic
EURO Band
USA Band
JAPAN Band
AUS Band
AUS2 Band
Here it accept any selected band, but i can get no signal in either 900 or 2100MHz.

USE THIS INFORMATION AT YOUR OWN RISK, I AM NOT RESPONSIBLE FOR YOUR DEVICE.
Its been a while since there was no activity here...
After countless reflash and handful of softbricks, My latest findings are:
- the baseband of the SGW does not work with Exhibit II rom - http://imageshack.us/photo/my-images/688/sc20120219093621.png/
- you can crossflash the Exhibit II with SGW rom - http://imageshack.us/photo/my-images/821/sc20120219100916.png/
Issues are:
- swapped keys,
- no camera,
- can't enter into service mode and
- no 900/2100MHz 3G !!!
Basically everything else works.
And NO, there is NO overclock, the phone runs on stock 1024Mhz.

i8150 with 850?
Have you got your i8150 working in 850? Do you have the baseband file?
Thanks in advance,
Hernan

arth_ur said:
Thank you for the file.
In the service menu
* # * # 1 9 7 3 2 8 6 4 0 # * # *
If you select:
[1] Debug Screen
+
[8] Phone Control
+
[7] Network Control
+
[2] Band Selection
Unfortunately the SGH-T679 does not have combi-band options.
Key in [4] (tap [menu], than Key in), displays a hidden menu:
"[1] GSM 850
[2] GSM 900
[3] GSM 1800
[4] GSM 1900
[5] WCDMA 850
[6] WCDMA 900
[7] WCDMA 1800
[8] WCDMA 1900
[9] WCDMA 2100
If you want to add other bands
choose band that youa want again"
However it doesn't change anything regardless what you choose next.
You can also enter
*#*#info#*#* (*#*#4636#*#*)
and you tap [Phone info],
then you can "Set preferred network type:"
choices are:
WCDMA preferred
GSM only
WCDMA only
GSM auto (PRL)
CDMA auto (PRL)
CDMA only
EvDo only
GSM/CDMA auto (PRL) - default by My phone
Unknown
I tried a few options but no help.
There is also a [menu] key [Select radio band], where choices are:
Automatic
EURO Band
USA Band
JAPAN Band
AUS Band
AUS2 Band
Here it accept any selected band, but i can get no signal in either 900 or 2100MHz.
Click to expand...
Click to collapse
The band selection menu can be accessed by dialling *#2263#.
I tried Menu key -> Key Input -> 4
The list of 9 bands came up, but nothing happens after selecting any one of them.
Strangely, if I select [2] WCDMA Band Preference -> [6] WCDMA ALL (that means it's on WCDMA only and it receive signal of all bands), the 850MHz-only network in Australia (Telstra NextG) came up in manual network search under Settings -> Wireless and network -> Mobile networks -> Network operators.
If I select [2] WCDMA 2100, Telstra doesn't come up because it uses 850MHz.
I'm on Vodafone Australia which uses 850MHz and 2100MHz in metropolitan areas and 900MHz in rural areas.
PDA: I8150ZSLM4
PHONE: I8150ZSLM4
CSC: I8150OZSLM4
---------- Post added at 03:39 PM ---------- Previous post was at 03:24 PM ----------
One more bit of information that might help you fix this.
In Service Mode -> MAIN MENU -> [3] UMTS RF NV -> [1] RF NV READ and [2] RF NV WRITE,
There are 4 bands,
[1] WCDMA 2100
[2] WCDMA 1900
[3] WCDMA 900
[4] WCDMA 850
That means the phone is coded to get reception from these 4 bands.
But when I tried to get in [2] RF NV WRITE -> [4] WCDMA 850, the process com.android.phone crashed. Is that a corrupted program file? Is this the cause of the problem?
Under [1] RF NV READ, information for all 4 bands can be accessed.

Hello. I would like to get a Galaxy W too, but I have the same problem as you: In my country 3G uses the 850 frequency!
Please let me know of your progress. Some Android devices come with a baseband changer (cyanogenmod 7.2 on Motorola Defy), but maybe it's because the phone does support both frequencies?
Thanks.
---------- Post added at 03:54 PM ---------- Previous post was at 03:34 PM ----------
Some Brazilian guys on this thread have the GT-I8150B, which seems to work with the 850 band.
http://forum.xda-developers.com/showthread.php?t=1466740
Here you can download 2.3.6 brazilian firmware for that model and extract the radio file to try on the GT-I8150 if you're brave.
http://www.sammobile.com/firmware/
If someone tries, let us know how it went!

My Galaxy W was sourced from Hong Kong and it was marketed as a quad-band (850/900/1900/2100) 3G device by both Samsung Hong Kong and the only 850MHz 3G carrier in Hong Kong, SmarTone. (Note that my phone is not network-locked.)
I notice that the CH configurations for WCDMA 850 are missing from service menu.
Under Service Mode (by whatever means you get in) -> MAIN MENU -> [6] COMMON -> [5] WCDMA SET CHANNEL:
Current CH: 0
Set Downlink CH, Input?
0: Reset
Set CH Range :10562-10842
Set CH Range :9662-9938
Set CH Range :2937-3088
10562-10842 are 2100MHz DL channels
9662-9938 are 1900MHz DL channels
2937-3088 are 900MHz DL channels
4357 – 4458 (850MHz DL channels) are missing
As DL channels of 850MHz are missing from this menu, my phone couldn't have possibly registered to any 850MHz network.
Is there any way to add them to the phone? Samsung is supposed to have done that, but they left it out.
Firmware version: I8150ZSLM4
According some other websites, the version number can be explained as:
I8150: model, ZS: China, Hong Kong, L: 2012, M: (Unknown month) 4: Version

Did anyone ever figure out if this is possible? I don't understand why the specs for this phone show 850 as a usable band if it's impossible to use.

[GUIDE][US998][TMO] Access to TMO Hidden Menu / Add Remove Bands (Band 71)

PREREQUISITES:
- US998 only
- Bootloader unlocked
- Rooted
RECOMMENDED:
Full system backup in case you don’t like what you’ve done.
NEED TO KNOW:
Performing these steps will remove the “default” unlocked bands. I have not figured how to get band to default. So insert disclaimer here about me, XDA, LG, and whoever you got your phone from being responsible for your phone.
HOW TO:
1. Go to play store and download “Shortcut Master (Lite):
https://play.google.com/store/apps/details?id=org.vndnguyen.shortcutmaster.lite
Or support the dev and download the full version:
https://play.google.com/store/apps/details?id=org.vndnguyen.shortcutmaster
2. Launch Shortcut Master and grant it root access.
3. Select the 3 dot menu and select “Search…”
4. Verify “All apps” are being searched on the left. Click the “Enter text to search” and type in “BandSelection” and select “Search”
5. You should see 5 items in the results. Select the “Hidden Menu com.lge.hiddenmenu.tmo_only.LTEBandSelection”option. In the subsequent popup select “favorite”. In the subsequent menu you can rename the shortcut to whatever you like or keep the default name shown. Select “Add” to complete the favorite selection. You should then be brought back to the 5 item search results.
6. repeat step 5 and select “Hidden Menu com.lge.hiddenmenu.tmo_only.BandSelection” and repeat this step to add it as a favorite. Once done, hit the back menu button and this will return you to your 2 newly created favorite shortcuts.
7. Select the “LTEBandSelection” shortcut (or whatever name you renamed it) to launch the LTE Band Selection app.
8. Click the checkboxes for the bands you desire. Obviously as a TMO’er I would recommend Bands 2, 4, 12, 66, and 71 as these are the bands in use in the US. If you travel overseas you’ll need to select other bands.
9. Click “Save” and you should see a “Save Succeeded” toast if your selections were successful, otherwise you will see “Save Failed”. At a minimum, I believe you need at least 1 LTE band (2, 4, or 12). Additionally, you cannot select the whole shebang of bands as well.
10. At this point you are done and the selected bands will be active. You can verify the selected bands to be active by backing out of the menu back to your favorites, and select “BandSelection”. You should see your selected bands under LTE BAND. WCDMA / GSM should remain as Default unless you decided to mess with it.
Q: How do I get my LTE BAND back to default?
A: Dunno at this point. You figure it out and let us know.
Q: Can I reset everything back to whatever I had originally?
A: Restore that backup! Or factory reset I suppose…
I have yet to personally verify Bands 66 (extension of Band 4) and 71, but I would imagine it should work. You can verify the selected bands using another app like LTE Discovery. It shows you exactly what bands your phone is currently getting. I have confirmed that selecting single bands will only allow you access to that band (i.e you select BAND 2, you only get that band and no others).
THANKS:
@vndnguyen for Shortcut Master
EDIT - Added some screenshots from the app...
EDIT - I verified carrier aggregation goes away if I deselect Band 66 while connected to Band 4.

vinniej said:
9. Click “Save” and you should see a “Save Succeeded” toast if your selections were successful, otherwise you will see “Save Failed”. At a minimum, I believe you need at least 1 LTE band (2, 4, or 12). Additionally, you cannot select the whole shebang of bands as well.
Click to expand...
Click to collapse
Thank you for this. Good to know the stuff we speculated about is actually (probably) coming true. We talked about this a lot and the T-mobile network folder in the US998 hidden menu:
December, 2017
ChazzMatt said:
It's not there yet without root. There IS a T-Mobile network folder, but cannot be accessed without root.
https://forum.xda-developers.com/showthread.php?p=74543993
Sent from my carrier unlocked LG V30+ US998
Click to expand...
Click to collapse
So, how many LTE bands total can you select? Like could you select ALL the T-mobile and AT&T LTE bands? Like 10 or 12 LTE bands?

ChazzMatt said:
How many can you select? Like could you select ALL the T-mobile and AT&T LTE bands? Like 10 or 12 LTE bands?
Click to expand...
Click to collapse
I'm guessing, but I think it depends on whether the bands are CA bands, or not. Some are dependent on another. For instance with band 66 which is a CA band for band 4. I don't think you can just select 66 without selecting 4.
I'm still experimenting with it and I'll update as I find out more.
EDIT: Band 10 is not available in the tmobile menu. However, I was able to select 1,2,3,4,5,7,8,12,13,66,and 71 without issue.

Can anyone confirm if this actually works?

MishaalRahman said:
Can anyone confirm if this actually works?
Click to expand...
Click to collapse
Uhhh....Yea...ME. What are you questioning??
EDIT - I should give you a better answer...I have confirmed that selecting bands in this menu does indeed change the bands that are able to be received by the handset. As I am in the USA and on tmobile, I was only able to confirm bands 2,4,and 12. If I travel about an hour north, I can confirm 71.

vinniej said:
Uhhh....Yea...ME. What are you questioning??
Click to expand...
Click to collapse
You said you didn't verify if bands 66 and 71 work in the OP

MishaalRahman said:
Can anyone confirm if this actually works?
Click to expand...
Click to collapse
I understand what you are asking. It's confirmed this process adds those bands to the LTE bands list, but you are asking for proof if there's actually reception. You would need a T-mobile user with US998 and T-mobile SIM card in an area that has LTE band 66 or the very new LTE band 71.
That proof will come soon...
vinniej said:
I have yet to personally verify Bands 66 (extension of Band 4) and 71, but I would imagine it should work. You can verify the selected bands using another app like LTE Discovery. It shows you exactly what bands your phone is currently getting.
Click to expand...
Click to collapse
vinniej said:
I have confirmed that selecting bands in this menu does indeed change the bands that are able to be received by the handset. As I am in the USA and on tmobile, I was only able to confirm bands 2,4,and 12. If I travel about an hour north, I can confirm 71.
Click to expand...
Click to collapse

This makes me want to buy one from B&H. My V30+ (H932BK) is great, but to have one I can root as well as ensure works with T-Mobile's band 71 would be awesome.

vinniej said:
I was able to select 1,2,3,4,5,7,8,12,13,66,and 71 without issue.
Click to expand...
Click to collapse
That would be plenty. And I don't even need 66 and 71! (I'm on AT&T Prepaid.) But just in case...
Sent from my official open market LG US998 V30+

ChazzMatt said:
That would be plenty. And I don't even need 66 and 71! (I'm on AT&T Prepaid.) But just in case...
Sent from my official open market LG US998 V30+
Click to expand...
Click to collapse
Just added a screenshot showing bands 66 and 71 selected. I do plan on making that drive to verify Band 71.

ChazzMatt said:
That would be plenty. And I don't even need 66 and 71! (I'm on AT&T Prepaid.) But just in case...
Sent from my official open market LG US998 V30+
Click to expand...
Click to collapse
Although i can't remember exactly off hand. I believe it was posted somewhere that the T-Mobile version actually supported bands: 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 28, 29, 30, 38, 39, 40, 41, 46, 66, and 71.
Would the person confirming this mind testing all of those enabled at once, please and thanks?

jcsww said:
Although i can't remember exactly off hand. I believe it was posted somewhere that the T-Mobile version actually supported bands: 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 28, 29, 30, 38, 39, 40, 41, 46, 66, and 71.
Would the person confirming this mind testing all of those enabled at once, please and thanks?
Click to expand...
Click to collapse
Here you are good sir (or ma'am...don't want to assume). I was able to select all of the bands you requested.

vinniej said:
Here you are good sir (or ma'am...don't want to assume). I was able to select all of the bands you requested.
Click to expand...
Click to collapse
Thank you! Definitely not a ma'am but I don't like being referred to as sir either. Makes me feel old.

Hi guys, I have a T-Mobile V30 and whenever I hit Reset at the bottom of the Band Selection menu, everything goes back to normal. Ie, I've locked to B71 only then hit reset and B2, B4, B71 all connect just fine, and CA where applicable. PS: there is another menu called "LTE Band Selection" and it does not have Reset at the bottom. BE VERY CAREFUL if you encounter this menu, I almost screwed up my phone until I found the "Band Selection" menu.
Since you have root, Network Signal Guru is also another tool to assist in locking bands and or verifying what's activated and deactivated.
If you have any more questions about the V30's engineering menu, Network Signal Guru, or B71 let me know.
https://play.google.com/store/apps/details?id=com.qtrun.QuickTest
Example:
https://i.imgur.com/prXUCj5.png
https://i.imgur.com/6oIiMRI.png

cstark27 said:
Hi guys, I have a T-Mobile V30 and whenever I hit Reset at the bottom of the Band Selection menu, everything goes back to normal. Ie, I've locked to B71 only then hit reset and B2, B4, B71 all connect just fine, and CA where applicable. PS: there is another menu called "LTE Band Selection" and it does not have Reset at the bottom. BE VERY CAREFUL if you encounter this menu, I almost screwed up my phone until I found the "Band Selection" menu.
Since you have root, Network Signal Guru is also another tool to assist in locking bands and or verifying what's activated and deactivated.
If you have any more questions about the V30's engineering menu, Network Signal Guru, or B71 let me know.
https://play.google.com/store/apps/details?id=com.qtrun.QuickTest
Example:
https://i.imgur.com/prXUCj5.png
https://i.imgur.com/6oIiMRI.png
Click to expand...
Click to collapse
But this is NOT the T-mobile H932. This is the US998, rooted. The engineering menus are different. This LTE Band Selection DOES have reset. See it at the bottom of the screenshot?
Whereas, on the non-rooted US998, there is another LTE Selection menu which only allows you to choose one band at a time. Yes, that one can mess you up. But the menu shown in the OP of this thread shows LTE band menu with check boxes, where you can choose whatever bands (plural) you want to enable -- and has re-set.
Also, this thread shows how you can use root to populate MORE bands into that menu.
THIS is EXACTLY what everyone has been begging for -- and as soon as @vinniej or somebody else provides definite proof that LTE bands 66 and 71 are not only chosen but have reception, then there would be no reason to buy a T-mobile V30 H932. The US998 V30 has root and would have all the T-mobile bands.

Thanks for explaining it @ChazzMatt

Chaz do you have bands 25 and 26 also?

JWnSC said:
Chaz do you have bands 25 and 26 also?
Click to expand...
Click to collapse
Are you asking do I have 25 and 26 normally on AT&T? Yes, at least 25. I don't see 26. This is a pre-root screenshot from my V30, posted in another thread., from my AT&T SIM card on AT&T Prepaid.
I have not attempted what's in this thread yet, as it was just posted last night. I only have time on the weekends to actually mess with my phone.
My V30 US998 (not my daily V30+ US998) is rooted, has TWRP and Magisk. But for some reason it didn't recognize my AT&T SIM card, even though that same phone had used the exact same SIM card for WEEKS before I got my V30+. I was going to have either factory reset everything and start over or create an APN from scratch. By this time it was Super Bowl Sunday afternoon... so I put the spare phone away. Right now I'm still using unrooted V30+ as daily driver.

ChazzMatt said:
But this is NOT the T-mobile H932. This is the US998, rooted. The engineering menus are different. This LTE Band Selection DOES have reset. See it at the bottom of the screenshot?
Whereas, on the non-rooted US998, there is another LTE Selection menu which only allows you to choose one band at a time. Yes, that one can mess you up. But the menu shown in the OP of this thread shows LTE band menu with check boxes, where you can choose whatever bands (plural) you want to enable -- and has re-set.
Also, this thread shows how you can use root to populate MORE bands into that menu.
THIS is EXACTLY what everyone has been begging for -- and as soon as @vinniej or somebody else provides definite proof that LTE bands 66 and 71 are not only chosen but have reception, then there would be no reason to buy a T-mobile V30 H932. The US998 V30 has root and would have all the T-mobile bands.
Click to expand...
Click to collapse
I wasn't suggesting anyone buy a T-Mobile V30. I read the OP and wanted to offer my insight, after having used the menus extensively. I completely understand what you said, you just repeated what I typed essentially so sorry if there was some confusion. I'm not asking for help with my phone, only trying to help you guys.
@vinniej mentioned not knowing how to restore the "default bands" that's why I mentioned the Reset button. But, Network Signal Guru is another tool as well.
Cheers...

cstark27 said:
I wasn't suggesting anyone buy a T-Mobile V30. I read the OP and wanted to offer my insight, after having used the menus extensively. I completely understand what you said, you just repeated what I typed essentially so sorry if there was some confusion. I'm not asking for help with my phone, only trying to help you guys.
@vinniej mentioned not knowing how to restore the "default bands" that's why I mentioned the Reset button. But, Network Signal Guru is another tool as well.
Cheers...
Click to expand...
Click to collapse
I understand you were trying to help. However, your post -- unintentionally -- did cause some confusion, at least in my mind and @vinniej. I know you only meant to help, and I thank you for that. But you have not used the US998 menus extensively (have you?). There are differences in the hidden menus between those models, just as there are differences with the Verizon V30 menus.
Maybe with root, now there's less differences or no differences since we can access "all" menus now? I don't know.
Yes, with root, this "new" LTE Band Selection menu is now like the T-mobile menu discussed and shown in other threads. However, your screenshots are different, probably because you are using an app to access them?
I do not mean to denigrate your contributions in any way, but felt I had to clarify there IS a reset button on this LTE Band Selection menu and you can check off what you want and don't want.
This thread is EXACTLY what everyone has been asking for. All we have to do is confirm there's actually reception on these new bands.

SM-T807P with not support to WCDMA

I have a SPRINT SM-T807P pre-owned tablet working 100% OK.
The device IMEI is clean and I'm outside the US.
I could find the 2G/3G/4G technology and bands supported prior to buy the device through eBay.
Then, running stock ROM MM 6.0.1 updated > root > unlock and debranding to clean SPRINT apps and restrictions with others carriers SIMs.
I have 3 SIMs from my 3 local carriers and I know I can't use LTE since the carriers LTE bands are not compatible with the device (Band 2 and Band 4 required by the carriers)
www_gsmarena_com/samsung_galaxy_tab_s_10_5_lte-6235.php
No problem with that, I can use 3G/2G mobile data for my internet surfing and email check tasks.
My problem is that my device is not supporting WCDMA!
When I'm in IOTHiddenMenu > ##DATA# Menu > HDR/1X Selection, I have only these options:
1) Hybrid
2) CDMA Only
3) EVDO Only
4) EHRDP 1x
5) Global
6) LTE + CDMA + EVDO
7) LTE only
As you can see there is nothing related to WCDMA!
Using "Global" is not the trick.
In GCF SETTING when going to
[2]UE Setting & Info
[1]Setting
[1]Protocol
[2]NAS
[1]Network Control
[4]BAND SELECTION
I can see "WCDMA Band Preference" > "WCDMA ALL" option but this setting is not saved.
Only are saved the options related to LTE, CDMA or LTE+CDMA.
Same behavior when going to RADIO SETTINGS > Set preferred network type. GSM/WCDMA options present but are not being saved nor accepted. I can save only options with LTE or CDMA (or both) involved.
RTN RESET and NV REBUILD done without getting WCDMA enabled after the tasks.
Now I'm in the way of discover why all the people with SPRINT SM-T807P can enjoy WCDMA services after unlocking the device and I can't do it as expected.
I'm thinking that is a restriction on the stock ROM.
I have a MSM8974 board with a Snapdragon 800 processor.
Build ID MMB29M.T807PVPU1CPI1
Any help/advice to enable WCDMA on the device will be really appreciated.

Additionally, when I'm in RADIO SETTINGS for some reason I can't select some options.
With a (*) mark are my "selectable" options. The other ones can't be assigned...
WCDMA preferred
GSM only
WCDMA only
GSM auto (PRL)
(*) CDMA auto (PRL)
(*) CDMA only
EvDo only
(*) GSM/CDMA auto (PRL)
(*) LTE/CDMA auto (PRL)
(*) LTE/GSM auto (PRL)
(*) LTE/GSM/CDMA auto (PRL)
(*) LET only
(*) Unknown
All the "selectable" options were tested (selected and restart) with no success...

Maybe I need to enable LTE/HSDPA/GSM required bands through CDMA Tools or it seems to be a bad idea?

Adding additional LTE Bands was not possible with CDMA tools.
The new selection is not being saved.
I'm in the way of flashing the stock SM-T807T (T-Mobile) on my SM-T807P (Sprint) to check the behaviors.
Any advice will be really appreciated...

I could see at the Qualcomm website that the Snapdragon 800 processor supports WCDMA and full LTE bands frecuencies:
Supported Cellular Technologies
LTE FDD
LTE TDD
LTE Broadcast
WCDMA (DC-HSDPA, DC-HSUPA)
TD-SCDMA
CDMA 1x
EV-DO
GSM/EDGE
https://www.qualcomm.com/products/snapdragon/processors/800
I'm in the way (too) of searching for the correct MODEM flash file to get LTE, WCDA and GM/EDGE fully unlocked and working...

It was not possible to flash SM-T807T (T-Mobile) stock ROM from SAMMobile on SM-T807P (Sprint)
There is a Odin error.
I will try by editing NV to get the bands working...

Well, after working with CDMA Tools, NV Manager and editing the build.prop file, now I can see my required LTE, WCDMA and GSM additional bands! No more "Searching network connection" on the top left corner.
But the signal icon on the top right corner is always empty (no signal at all).
I have checked, deleted and reconfigured the APN, with no success.
And still I can't set "GSM auto (PRL)" on the Service Mode as "Preferred Network Type" so I believe I'm missing something else.
I'm really exhausted, I need help to be able to get my Samsung Galaxy Tab S working OK on my local GSM networks.
I will open a new thread offering to pay/donate for the service to have my device working on GSM ...

[GUIDE] [AT&T Z999] Unlock hidden GSM & LTE bands for international use

Hello.
AT&T has disabled all the international GSM\LTE bands on Z999, making it unusable outside of USA (at least in countries with GSM 900\1800, UMTS 2100 & LTE B3 & B20, like the one I live in). In order to change that, we need to turn on the Qualcomm USB Diag port, and for this, the phone has to be rooted.
I've been trying to root my AT&T Z999 for some time now, without any success, unfortunately. However, searching forums after forums, sites after sites, I've discovered the surprisingly easy method of turning on the Diag port without root.
It appears, that Axon M shares a lot with Axon 7, at least the secret key combination to enter Factory Test Mode:
Turn off the phone
Press and hold Power + Vol DOWN buttons until you see the screen "FTM" (see attached screenshot)
You have to press both buttons for the long time, do not release them when the phone starts - just wait until you see the screen. And that's it - you are now in Factory Test Mode and PC sees your phone as "ZTE Handset Diagnostic Interface (COMxx)"
Now, in order to change the bands, you have to follow these guides one after one:
Backup IMEI and NVRAM (ignore all the steps to turn Diag port on, you've done that already)
Unlock LTE bands
Mod edit: Link removed! (this guide in in Russian, but all screenshots are in English & every step is pretty clear)
You would need this tool also.
Please remember, these things are complex, and require considerable experience with Android & Windows. DO NOT START unless you feel confident that you know, what you're doing. I'm serious. Do not try this, if you're not experienced.​
WBR,
Draco.

Why mods deleted the link? Google translate exists.
Edit:
I've managed to get the data from the phone using QXDM.
lte_bc_config contained the value of "2251800618993690" now I'm parsing the info how to edit this. Seems like the tutorials don't really match this device. Now I wonder if the chipset can handle invalid data and just input all 1's. Unsupported frequencies just won't work.
Edit2: Writing all 1's didn't work.
Edit3: I wrote this value: "2251802901219551" Calculated with CDMATool. But it seems like the AT&T firmware only finds edge network. I've double checked the bands to be correct ones. So now I will switch to the chinese firmware.
Edit4: Final edit. Turns out you cannot flash chinese firmware on AT&T device. Sigh so my unit is stuck to EDGE/wifi only.

Drakosha said:
Hello.
AT&T has disabled all the international GSM\LTE bands on Z999, making it unusable outside of USA (at least in countries with GSM 900\1800, UMTS 2100 & LTE B3 & B20, like the one I live in). In order to change that, we need to turn on the Qualcomm USB Diag port, and for this, the phone has to be rooted.
I've been trying to root my AT&T Z999 for some time now, without any success, unfortunately. However, searching forums after forums, sites after sites, I've discovered the surprisingly easy method of turning on the Diag port without root.
It appears, that Axon M shares a lot with Axon 7, at least the secret key combination to enter Factory Test Mode:
Turn off the phone
Press and hold Power + Vol DOWN buttons until you see the screen "FTM" (see attached screenshot)
You have to press both buttons for the long time, do not release them when the phone starts - just wait until you see the screen. And that's it - you are now in Factory Test Mode and PC sees your phone as "ZTE Handset Diagnostic Interface (COMxx)"
Now, in order to change the bands, you have to follow these guides one after one:
Backup IMEI and NVRAM (ignore all the steps to turn Diag port on, you've done that already)
Unlock LTE bands
Mod edit: Link removed! (this guide in in Russian, but all screenshots are in English & every step is pretty clear)
You would need this tool also.
Please remember, these things are complex, and require considerable experience with Android & Windows. DO NOT START unless you feel confident that you know, what you're doing. I'm serious. Do not try this, if you're not experienced.​
WBR,
Draco.
Click to expand...
Click to collapse
Does this really work? Anyone else tried?
Sent from my SM-N950F using Tapatalk

can you repost the 3rd link?

I can't "repost" the 3rd link, but I can suggest you to open the well-known (and the best) Russian web-site with the name starting with "4" (and having something like "...pda" also), and then add this to the address: /forum/index.php?showtopic=546814&st=4640#entry35702698

Well that russian site has pretty good instructions on how to do it. I tried with one program and it didn't work on AT&T ZTE. I'll try with that qualcomm app again this weekend but if I remember right the last time it had trouble writing because it had no correct service mode code \o/

Drakosha said:
I can't "repost" the 3rd link, but I can suggest you to open the well-known (and the best) Russian web-site with the name starting with "4" (and having something like "...pda" also), and then add this to the address: /forum/index.php?showtopic=546814&st=4640#entry35702698
Click to expand...
Click to collapse
that website's address ends with ".RU", doesnt it?
i accessed that website as your given link, but i cannot see any related threads about ZTE on that, seems all they disscussed about is Lenovo K910SS. was something wrong with my searching?

gaosilver1000 said:
that website's address ends with ".RU", doesnt it?
i accessed that website as your given link, but i cannot see any related threads about ZTE on that, seems all they disscussed about is Lenovo K910SS. was something wrong with my searching?
Click to expand...
Click to collapse
Every Quallcomm device has almost the same NVram configuration rules, the difference is usually on how to enable diagnostic port, but for Z999 I have figured that out already. So, for the configuration process, every Quallcomm guide should work.
I've successfully enabled Z999 to work with 2G & Edge in my country using these guides. 3G & LTE don't work yet, but I'm sure they will eventually. I don't believe Z999 lacks the hardware ability to use LTE B3 & B20 (and other bands), it has to be something wrong with NVram parameters.

For me 2G and Edge worked out of the box in Finland. Tried to enable more but only thing that changed was power usage. Not worth it

Drakosha said:
Every Quallcomm device has almost the same NVram configuration rules, the difference is usually on how to enable diagnostic port, but for Z999 I have figured that out already. So, for the configuration process, every Quallcomm guide should work.
I've successfully enabled Z999 to work with 2G & Edge in my country using these guides. 3G & LTE don't work yet, but I'm sure they will eventually. I don't believe Z999 lacks the hardware ability to use LTE B3 & B20 (and other bands), it has to be something wrong with NVram parameters.
Click to expand...
Click to collapse
It means success unlock 2G/EDGE, not yet with 3G and LTE? When buy the device, it can use other carrer to call and 2G.
When you finger out the way to unlock LTE, please share me.
by the way, do you have the way to enter fastboot mode? I tried the "volunm + &power button" but it just do a normal restart into android.

Fair warning to everyone trying this, make sure you actually do a backup of your IMEI. I didn't and after screwing something up my SIM is no longer detected, and my IMEI is no longer available.

Hello folks!
I have an AT&T phone. I cannot connect to ANY (even EDGE) network!
I modified the configuration several times:
---
I have EDGE with this config:
00441: 0 and 0xFFFF
00946: 0 and 0x06A8
01877: 1677472
02954: 0
06828: 524356
06829: 524356
I got no LTE
---
test2:
06828: 524485
06829: 524485
I got no LTE
----
00441: 0xffff (but 0x380 is recommended)
00946: 0xff8
02954: 0 and 805765120
01877: 3460734838925427584
06828: 1904863
06829: 1904863
I got no LTE, just continous dropping network, useless config.
----
00441: 896
00946: 0 and 0x140
02954: 0 and 131072
01877: 562949974393728
Only edge network, error while searching for networks.
----
06828: 524485
06829: 524485
I have EDGE with this config, but no LTE.
----
Anyone has a good and working LTE mode?!
edit: "The bands on the AT&T z999 are: 2, 4, 5, 12, 29, 30, and 66. "
So, there won't be any Band 1,3,20 for us?!
Thanks!

No one has gotten LTE work on AT&T model. I wouldn't try this.

hene193 said:
No one has gotten LTE work on AT&T model. I wouldn't try this.
Click to expand...
Click to collapse
I had nothing, now I have EDGE, so I am glad to did that modifications...

Drakosha said:
Every Quallcomm device has almost the same NVram configuration rules, the difference is usually on how to enable diagnostic port, but for Z999 I have figured that out already. So, for the configuration process, every Quallcomm guide should work.
I've successfully enabled Z999 to work with 2G & Edge in my country using these guides. 3G & LTE don't work yet, but I'm sure they will eventually. I don't believe Z999 lacks the hardware ability to use LTE B3 & B20 (and other bands), it has to be something wrong with NVram parameters.
Click to expand...
Click to collapse
Have you been able to make 3G & LTE work? I just got my ZTE AXON M from ebay and since I can't use data or make calls/unlock the phone I was thinking of trying this.

Drakosha said:
Every Quallcomm device has almost the same NVram configuration rules, the difference is usually on how to enable diagnostic port, but for Z999 I have figured that out already. So, for the configuration process, every Quallcomm guide should work.
I've successfully enabled Z999 to work with 2G & Edge in my country using these guides. 3G & LTE don't work yet, but I'm sure they will eventually. I don't believe Z999 lacks the hardware ability to use LTE B3 & B20 (and other bands), it has to be something wrong with NVram parameters.
Click to expand...
Click to collapse
Can I describe in detail how to enable 2G?
Thanks !

Hello guys. I've tried all configs mentioned by @ugynok and some of my own - the result is still the same, no 2G network and all options in mobile connections are disabled not clickable. Can you please advice which config worked for you to enable 2G network?

Any luck?
Hi all. Was anyone able to get a useful set of bands working in the UK for this phone?
Many thanks.
V

Drakosha said:
I can't "repost" the 3rd link, but I can suggest you to open the well-known (and the best) Russian web-site with the name starting with "4" (and having something like "...pda" also), and then add this to the address: /forum/index.php?showtopic=546814&st=4640#entry35702698
Click to expand...
Click to collapse
It's the mistake. I don't know how to delete it, sorry.

Samsung s20 enable UMTS 4 question

hi all,
Have a question about unlocking the umts band 4(aws 1700) for a s20 sm-g9810 HK version. Hope someone can help me to sort it out.
Following the guides in this forum, I enabled the band using QPST and QXDM to write NV 1877. The white was successful, and the Samsung Band Selection app shows wcdma IV 1700(it wasn't
there before modifying NV). However, when I select the band or change network mode to 2G/3G, I can't make any call with Freedom Mobile, which is using UMTS 4 for voice.
Does anyone know if the hardware supports this band?
Thanks!