Develop Bugs

GSM Radio -Quad Band or Alter Tri-Band

Can anyone tell me if it is possible to change the HTC from a Euro phone to a North American phone by perhaps changing a chip or programming to support 850/1900 here in North America? I live in an area where 1900 is a bit spotty and I lose signal, especially inside buildings. I love my Uni, but I have too many people complaining that I'm not getting their calls and I don't get signal where other's do.
I'm afraid I don't have enough hardware experience to be qualified to even venture a guess. But shouldn't it be as easy as changing a chip or a crystal or something?

It's just a matter of both the range of the tower you're near, as well as possibly your PRL. The priority roaming list tells the phone who's service you're allowed to use. So if there's a tower within range, but not in the PRL, chances are your phone won't use it OR it will show up as roaming.
I know you can affect the 3G part of Android phones by changing the modem firmware when using Odin, and even them I'm not sure what change is made if truly any. I don't have 3g yet with my provider, which uses the 850/1900 as well, but I currently have a Euro firmware on my phone using XW Euro firmware. I'm not sure how it will affect my 3g until my provider enables it.
Other than that, I think it's a limitation of the radio chip in the phone. It may be a firmware/software setting, or it could be hard coded into the chip.. again I'm not sure

Have you seen the previous post date? lol.
Anyway thanks for your reply

Lol, true it's old, but if anyone has a solution I'd accept it. However, I've since moved on with 3 different phones including the PPC6800, the Omnia II and presently on the iPhone 4.
Thanks anyway,
TS

No it is not possible, it´s a hardware related stuff.

Timeshell said:
Lol, true it's old, but if anyone has a solution I'd accept it. However, I've since moved on with 3 different phones including the PPC6800, the Omnia II and presently on the iPhone 4.
Thanks anyway,
TS
Click to expand...
Click to collapse
you have to change the part which contains the Radio hardware

[Q] Using a Vodafone TP2 in US, Advice please?

Hi,
I am about to visit New York and was wondering whether I can use my VF Touch Pro 2. It is unlocked for international use. However I am not totaly sure that its frequency is right for the US. Perhaps it can be used over GPRS and not 3G?
Also the prices are pretty hefty... £1.35 per minute and £3/MB for first 5MB and then £15 per 5MB.
Some good advice on the above would be appreciated.
Thanks,
Sam

Vodafone TP2
In US, you will roam on the AT&T network and the 3G frequencies are 850/1900. Your phone has 900/1800/2100 3g frequencies, so no, it will not see 3G speeds. You can, however, expect to get EDGE service, but that will be prox 100KBS speeds, so double dial up speeds, but much slower than 3G. OK for email, but web is dog slow. NY has poor 3G service, in general, due to heavy users and lot's of people.
If you need data, better to find wifi hotspot and use that.
Welcome to America, and the incompatible world of roaming with 3G.
MWS

Thanks for this... Useful
Hi,
Thanks for the reply.
So my options are:
1) GPRS/EDGE with email used sparingly
2) TP2 with Wifi
Also I guess I cannot purchase a local SIM since my phone is a VF. Having said that I am not sure that VF have locked it. So perhaps purchasing a local PAYG SIM may be a cheap option????..... or go on hols properly and stay away from the mobi
Thanks,
Sam

Thanks all.
Returned from US. All worked fine, now waiting for my bill! No 3G though of course.
Sam

Japan Docomo Note 2 No reception No service

Got a Japan version note 2 SC-02e, after flashing MIUI rom, everything works fine except the phone function. There is no data, no signal, no reception whatsoever. I tried to manually search the service operator, but it turns out nothing. I suspect it may be a problem caused by its unique band. I appreciated any fix suggestion.:laugh:

you might have accidentally unknowingly regretfully ****ed up your imei i.e. ****ed phone features.
before regretting try restoring nand/stock firmware etc.
if you made a backup of your efs then there shouldn't be much to worry.
if not and restoring stock doesn't work, then go to a service center and convince them that you are a innocent cute little guy whose phone was ****ed up in the morning.
Good Luck

Most common mistake for most people or noobs is that they did not know what they are
doing with their devices. Most probably you have screwed your EFS folder.
Read here: http://www.xda-developers.com/android/backup-and-restore-your-efs-folder-on-samsung-devices/
AND NOW
you have to do it the hard way.
Read here:http://forum.xda-developers.com/showthread.php?t=1264021

I hope this isn't too late to help you but are you running the SC-02E in Japan, and if so are you using Docomo or are you trying to use it on a different network?
I've experienced similar problems in the past and in my case the cause there were two separate causes. First of all Docomo Xi phones sometimes have issues when trying to connect to a non-LTE network (such as with B-mobile or softbank) yet often have had the menu options for turning off LTE removed. I had a similar issue when I used my SC-06D with a 3G B-mobile sim (which uses the same 3G network as Docomo) and at first I had the issue of not getting any connection. However after I used a 3rd party app to disable LTE (LTEOnOff) I was able to connect without any issues.
The other cause may be as you said from the unique bandwidths. Japan's LTE network is different from other countries, and traditionally the only common 3G bandwidth used in Japan that is used in other countries often is the 2100mhz one (although Softbank did recently implement 900). Therefore if you managed to flash a ROM for one of the overseas N7105's then it's quite possible your phone is having trouble due to the LTE bandwidths. You could try disabling LTE (as above) and then seeing if your phone connects via the 2100 bandwidth. If that works then then you will probably need to try flashing a Japanese radio (from the SC-02E) to get it to work. This is something that I am trying to get working myself.
For the record Docomo's network runs on 2100/1700/800 for 3G (although 1700 seems to be rarely used) and 2100/1500 and possibly 850 for LTE. Softbank has 2100/900 for 3G and 2100 for LTE. AU runs on CDMA and CDMA2000 technology and thus their network isn't compatible with Docomo's phones.

Tab S 8.4 LTE SM-T705 random disconnects from mobile network

Hi
Anyone else get random disconnects from mobile network? My device says H+ has a good signal but can't transfer data. Enabling/disabling flight mode fixes. I believe it's linked to cell handover or LTE <--> WCDMA handover. Does not do it if device is stationary. Sim works fine in my xperia z3, likewise sim from Z3 (different network) has same issues when installed in TAB S.
To complicate things, I have also seen issues with BT tethering, using phone for data transfer when device in this non working state. Again, in/out of flight mode fixes. WiFi works just fine.
Device is latest stock firmware, not rooted because I like OTA, and have no time to fiddle these days.
Just switched it to WCDMA-only for a test tomorrow. I commute same route by train each day.
Really annoying. Afraid tab is headed for fleabay if I can't solve. Beginning to think it's a designed-in Samsung issue. [emoji20]
Nigel

I am experiencing the same issue with my LTE signal. it says 4g with 2 bars of signal then suddenly the arrows stops so transmission of data also stops then airplane mode sometimes no longer work. i would have to put the device to WCDMA only then back to LTE.. I can force my device to use LTE only bad sadly the signal drops almost 1 minute after connection

Is your device exynos based or snapdragon. There are two variants doing the rounds with the snapdragon only in the US. On exynos based devices, an Intel LTE chipset provides the LTE connectivity. I believe the US version uses the (faster and better) snapdragon due to a lack of LTE band support in the frankenstein exynos/intel solution. I wonder if the intel lte chip does everything or if the exynos is left to do 2g/3g?
I have disabled 4G on my tab s and the random disconnects appear to have stopped. Did not buy a 4G tablet to have to disable 4G to make the ruddy thing usable though!
Device is also very jerky in comparison to my snapdragon based phone. Not enjoyable to use really. Prob due to all the junk (touchwiz) that samsung shove on it. Its a huge shame because I love the design and build of it, as well as the elegant way in which the stock cover attatches. Good hardware let down by very poor software for the most part.
I think i'll give up on it as a bad job, shove it on ebay and buy a Z3 Tablet Compact instead which is snapdragon 801 based.
Nigel

*#0011#* Service Mode SM-T705
Hi
Been fiddling with band settings in the service menu in order to solve this issue.
See: http://forum.xda-developers.com/galaxy-tab-s/help/unlock-aws-tab-s-8-4-lte-t2860001
I have disabled the 2G,3G and 4G bands that my network does not use - at least it will save the device from hunting for stuff that it is never going to find. Of course, it will need to be re-enabled when I go abroad.
Will see if it makes any difference. One thing it is useful for is preventing the device switching from LTE to 3G where the LTE signal is marginal, and the 3G signal strong. Just disable the 3G band, and the device is forced to hold onto the LTE signal. Its also useful if you have a tablet and thus find 2G useless. Disable all the 2G bands and the device is prevented from connecting to 2G networks. It will then hold onto that 3G signal as much as possible rather than dropping down to a stronger 2G signal.
Nigel

I have the exynos version of tabS 8.4.. this fooled me when I bought my device since I was hoping for a Snapdragon version.. but too late. I had to live with this.
what I normally use is *#2263# same with my galaxy note3.. I disable the wcdma and gsm. so forcing the device to LTE only. but this problem is that data transmission drops frequently.
when I tried what you said. signal seems to be better.. I'm still testing it out. thanks for this!
*update. same problem but less frequent.. so still crap:crying:

Guys
Possibly related is the S5 DUOS phone is also reporting issues with dropouts on LTE.....users are having to reset or enter Airplane mode to 'reset', could be a common chipset/firmware/modem issue perhaps.

So... I fixed my issue by buying a Sony Xperia Z3 Tab Compact.
Superb device, and so so so much faster than my Tab S + battery lasts much longer. Not had it long, but some initial thoughts here:
http://forum.xda-developers.com/showpost.php?p=56721334&postcount=11
Tab S 8.4 LTE (Exynos version) on fleabay soon!
Rather expensive mistake, and my final Samsung device for a while I think.
Nigel

it's a LTE band problem ; this is how to fix it
hello
first before u do anything , you have to look for the LTE frequencies used by ur provider , for example here in Morocco my provider Orange works on 800Mhz , 1800 Mhz and 2600 Mhz , which i LTE B3 ,B7,B20 .
So , i had to select only those bands only in the service menu (*#0011# : Back Back /UE setting & information/ Setting / Protocol /NAS/Network Control/Band Selection/[1] LTE BAND
All you need to select in the service menu is the Bands used by ur provider to avoid lost of network by ur Tablet when it s switching between bands which causes rebooting everytime .
i hope it works for u , because it works just fine for me

[Q] After unlock, only edge.

So i recently unlocked my phone, as am in Europe and now, with two different carriers all I've been able to receive is edge on the network. My imei code is still there when i do *#06# and I don't know if I messed my phone up because I cannot test it on T-mobile's network. Any clue one how to fix? The phone is currently running Stock 4.1.2 with root, because I downgraded to unlock. Any help is greatly appreciated.

Have you checked if the networks are compatible with the other bands?

serio22 said:
Have you checked if the networks are compatible with the other bands?
Click to expand...
Click to collapse
No? could you please provide more info on this?

Look up what frequencies the network providers support for 3g/h/4g or whatever, then see if your device supports them. If not, then what's why you only get edge

Late reply, but this phone is for T-Mobile and Videotron/Wind AWS networks; it will not work on European frequencies other than GSM unfortunately.

European with an American phone here! Been using the d2tmo (T999) for a few years in Europe and it is certainly possible to use data connections greater than edge. I am using 3g all the time and in various countries around Europe (no lte here yet). The problem might have been that:
a) the area where you were did not have 3g coverage, only edge - old cell phone towers perhaps?
b) your signal was too weak - in this case the phone will shift down to edge rather than using faster methods of connection
c) your provider only allows you to use lower speeds (for example in some countries O2 provides first 150 mb of the day at high speed and then reduces the speed by switching you to edge)
d) make sure that you have all network connections enables in settings-mobile networks-network mode. also enable data roaming just in case
I'm no expert in this field, but I have had similar issues before and these have worked for me. Good luck!