Develop Bugs

[Q] Use Unlocked SGH-I747 in Thailand on True Move 4G (2100mhz)?

Is there a way to check that the LTE radio on the ATT SGS3 will work with the 2100mhz band LTE in Thailand? I tried an updated SIM at the True Mobile shop this morning and my phone would not register on the LTE network. When selecting "Bearer" in APN settings, picking LTE would disconnect my mobile date - setting it back to 'Unspecified' allowed me back onto HSPA+ but not LTE.
- Is it possible for a carrier to restrict the types of phones that can access their LTE network, or is it as simple as having the correct radio?
- Are there different channels on the 2100mhz LTE spectrum, and is it possible ATT uses a different channel than True is using?
- How can I diagnose my radio connection to determine what could be preventing my access to LTE on the True network?
- What is the difference between LTE 700mhz Class 17 / 2100 and 2100mhz LTE?
ROM - SlimBean 7.2 weekly, stock kernel
MODEM - LK3
True Move Press Release - http://truemoveh.truecorp.co.th/news_events/news/entry/1392?ln=en
True LTE - 2100 mhz band 1
i747 LTE - 700 mhz band 17, 1700/2100 (AWS) MHz
- Is there a way to see if I am connected to their 850mhz 3G or 2100mhz 3G?
Please let me know what further information I can provide to facilitate a solution. Cheers and thank you in advance.
[EDIT] Upon closer inspection, these are loafers... er, rather I educated myself about LTE bands and AWS... a tad confusing, but going off of the Samsung website spects, the SGH-i747 is dual band LTE 4/17... which is incompatible with True's LTE band 1.
This may be the push that puts a SIV in my hands...

[Q] Does Lg G3 (D855) support T-Mobile LTE?

Hi All,
I got LG G3 D855 international version from eBay last week, I'm wondering if I can get LTE, or H+ network on the phone. On "Network Mode I can see "GSM/WCDMA/LTE auto" listed , when I choose it the signal bars on the notification area start looping, after that it switch back to "GSM/WCDMA" option !
I added a new APN for LTE , but still not working on LTE.
According to T-Mobile coverage map , my area is support 4G /LTE network . The phone is rooted , software version: V10b-GLOBAL-COM (For Hong Kong)
I can get 10-12MB download speed on H, I guessing it will be a way faster on H+ , or LTE.
Any idea about how to get LTE to work?
Thank you,

I'm surprised HSPA is even working, you must be in an area where they moved it to 1900 (Band 2). The D855 model doesn't support the AWS band, also known as Band 4 or the 1700 frequency (so says GSM Arena anyway) . This band is where T-Mobile has their primary network deployments these days. That means no HSPA+ (that's only on Band 4, not Band 2), and no LTE at all.
Bottom line is I don't think you want to be using the Euro D855 model on T-Mobile USA network. Not the right tool for the job.
Sent from my LG-V500 using Tapatalk

I think it should still work. Frequencies tmo supports (straight from website):
4G LTE : Band 2 (1900 MHz), Band 4 (1700/2100 MHz), Band 12 (700 MHz)
4G HSPA+: Band 2 (1900 MHz), Band 4 (1700/2100 MHz)
3G HSPA: Band 4 (1700/2100 MHz)
The phone supports 2100MHz and 700MHz, and not 1900 or 1700. I just did a speed test and get 4Mbps reporting it used HSPA+. If that works, I'm not sure why LTE wouldn't unless it *has* to have the 1700 to get LTE.
Edit: here's some info on the 700MHz band http://www.spectrumgateway.com/t-mobile-700a-spectrum. I'll try it when I'm on vacation. I live in NC unfortunately.

Hi, I use LG G3 D855 and looking for solution to get LTE on T-Mobile USA. After some research inside the forum, I decided to try to use CyanogenMod (CM 12.1) on my system.
It works well and now I can enjoy LTE on T-Mobile network, even though not pretty stable yet, but I am good with that since the OS still ongoing development.
You can try to download the OS on Cyanogen official website, and use the latest update available.
In order to confirm if you get LTE signal, beside check on your LTE sign, you can use LTE Discovery apps whenever you lost LTE connection and try to reconnect on an LTE signal.
Oh, forgot to mention, I am located in College Station, TX.

Beware: LTE Band 4 (1700/2100 combo) it's not the same LTE Band 1 (2100 only) that LG G3 D855 supports. Better talk using band numbers not frequencies.

D851 No WCDMA 850/1900 (HSPA), only GPRS/EDGE or LTE

Hello,
I have a D851 T-Mobile with Lollipop (D85120B) and I am unable to connect to WCDMA 850 or 1900Mhz bands. GPRS, EDGE and LTE work. If I select WCDMA only on the Mobile network screen, I lose signal and if I use the engineering menu ( 3845#*851#) to select WCDMA 850 I lose signal as well. GSM 850 (EDGE) and GSM 1900 (GPRS) on my provider (Fido/Rogers Wireless) works, however.
After I noticed this, I used QPST NV Editor to set the NV_RF_BC_CONFIG_I option to include all mobile bands. Unfortunately, I am still unable to get signal with HSPA. The phone support GSM 850 / GSM 1900 according to the box. Is this a firmware issue? Does T-Mobile firmware just not support HSPA?
Has anyone encountered this problem or come up with a solution?
Thanks in advance.

VS986 to use band 5 LTE abroad.

I meant to use band 5 lte in indonesia with smartfren using vs986. I used shortcut master lite app to enable band 5 (and/or disable irrelevant lte bands). However i still cant connect to it. I am certain that my location is under that lte band 5 coverage given that when i used other gsm sim i could see the network and attempt a registration on the network. Furthermore, seeing the networks rat id also match with the information online that it is indeed a band 5 lte network. However when i pop in the band 5 lte network gsm sim card, i am no longer able to scan for networks, it just fails to scan everytime, thus i cant connect. I wonder if there is a workaround to make vs986 able to connect to other lte networks other than verizon.
P.s. im on slim 13b rooted/xposed.

It's not just the bands. Verizon really borked the firmware of the phone to make sure that it doesn't work on any other 4G LTE network than its own. For instance, it doesn't work on AT&T and T-Mobile LTE network in the US either, even though the bands are supported.
What you can try is to switch the phone to "LTE/CDMA" mode in the "Network mode" settings. This will probably kill your phone connection, but if you get 4G LTE then, then you can try the same hack that worked for T-Mobile: http://forum.xda-developers.com/verizon-g4/general/guide-fix-vs986-dropping-to-3g-h-4g-lte-t3272434
But on some networks, there is no hope, for instance nobody was able to get it to work on AT&T.

I think i did check that thread out when i used t-mobile for about 6 months in seattle/udistrict/uvillage/uw areas, with no success. I never got the LTE connection. I wonder maybe its related to different roms/kdz/flashfire modified version of 13b that cause it. I hope someone whos lucky enough to get lte might share info about their 13b version/softwares that you debloat using debloater or froze using tibu. Thanks.
P.s. it was on 4g for an instant before it gives me no signal/network.

Why would VZW disable B5 if they have B5 sites?
That would really be stupid.
Posted using a calculator and delayed by AT&T.

LTE 2/4/5/13 can be activated using Shortcut master lite. The problem is that, when i used a simcard that utilized LTE band 3/8, i could detect/attempt registration to signal from LTE band 5 from local network through GSM (given that i activated it). However when I used simcard for that LTE band 5 network, somehow, i can no longer use gsm/cant search for network/crashed. It seemed that LTE antennae on this device is programmed to only accept verizon's. (For lte networks, apns are saved when i put MCC/MNC or RAT for verizons, but discarded when i put other). Thank god though i could still use umts/3g.
Edit: So i tried again. Turns out, i could to get registered on the network, checked on network type and strength (says 4g - 3/4 bars) also on lte discovery says connected. However signal bars says unable to connect to network. Verizon definitely prevent users to use lte on another network. What a **** company.

this is from Verizon website them self
Network
CDMA, GSM, LTE*
Frequencies
1.9 GHz CDMA PCS, 800 MHz CDMA, GSM 850/900/1800/1900 MHz, LTE 2/4/5/13, LTE 3/7 for Roaming*
which show it support band 3 in case of romaing only..but if you are in USA will not work sure as it is not romaing.

Unlocked sprint g8 no 3g or hspa

Im using this phone with cricket but for some reason it won't connect to 3g or hspa do anyone know why?

Perhaps because regular 2G, 3G or the faster 3G HSPA(+) on AT&T's network runs on GSM technology which is completely incompatible with the CDMA network Sprint uses for those technologies and the firmware on the Sprint variant is artificially limited to only be able to connect to CDMA and not GSM even though the phone's modem has the capability? Take what I'm saying with a grain of salt however.

DeyEatDaPooPoo said:
Perhaps because regular 2G, 3G or the faster 3G HSPA(+) on AT&T's network runs on GSM technology which is completely incompatible with the CDMA network Sprint uses for those technologies and the firmware on the Sprint variant is artificially limited to only be able to connect to CDMA and not GSM even though the phone's modem has the capability? Take what I'm saying with a grain of salt however.
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But I get Lte working fine.

lude86 said:
But I get Lte working fine.
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Yes, because LTE is its own technology. LTE, GSM and CDMA are each their own technologies, each completely different from the other in a multitude of ways. That's what makes one not compatible with the other, but with the advent of LTE it also made it much more cost-effective for device manufacturers to include 4G support for all major networks (provided the device supports the necessary bands and the carrier allows it, of course)... so yes, LTE should work flawlessly.

The specs on the LG Official Website for Sprint LG G8 shows it has all the 2G, 3G, and 4G bands on Cricket except it's missing B30 for 4G:
LTE Bands 1/2/3/4/5/7/8/12/13/17/20/25/26/28/40/41/46/66/71;
CDMA Band Class 0/1/10;
GSM 850/900/1800/1900 MHz;
UMTS Bands 1/2/4/5/8
Did you try to change the network mode to GSM/UMTS and reboot?

lentm said:
The specs on the LG Official Website for Sprint LG G8 shows it has all the 2G, 3G, and 4G bands on Cricket except it's missing B30 for 4G:
LTE Bands 1/2/3/4/5/7/8/12/13/17/20/25/26/28/40/41/46/66/71;
CDMA Band Class 0/1/10;
GSM 850/900/1800/1900 MHz;
UMTS Bands 1/2/4/5/8
Did you try to change the network mode to GSM/UMTS and reboot?
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Yeah thats what I thought too but even after changing the network mode and restarting still not getting 3g data

Yes you can dial *#*#4636#*#* , go to phone information or network, look for preffered network, then select wcdma preferred, it will switch to hspa+, do note there will be no indication, only a 3g symbol on the bars. if you download network info app, it will let you see that you are indeed on hspa

Ok after many attempts to bring up my 3g inwas able to do so by going into ##data# and resetting the apn then boom 3g icon popped up. Weird because the apn was correct in the first place prior. But thanks now it works

what is the recommended network i should choose for tmobile network. i have sprint version

tdsii said:
what is the recommended network i should choose for tmobile network. i have sprint version
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LTE. If you don't get good speeds (about 10Mbps) then change it to GSM. This is something I actually have to remember to do if I'm outside the house because I actually get more consistent performance inside my house using 3G HSPA+/GSM. On HSPA+ it goes to is 6Mbps which is plenty usable but normally it runs at 10Mbps which is more than enough for Full HD streaming whereas if I use 4G LTE under the same condition I'll either get 30Mbps or 1Mbps depending on the time of day and/or if the network is congested. 1Mbps is definitely not usable for anything but streaming at horrible quality or browsing basic webpages.