SHV-E210L Having signal/data issues - Galaxy S III Q&A, Help & Troubleshooting

I have the LGUPLUS korean galaxy s3 and am using an att simcard with it. Im not entirely experienced with phone tweaks so i was hoping someone on here can help. When i boot up my phone it will try to find signal, when it does the signal is usually low around one bar and is stuck on G data instead of 4g. Is there a fix to this? Or is there any modifications that can be made to allow the 4g data? Ive messed with he hidden menu but changing the settings didnt seem to help the extremely slow data issue. Any help is much appreciated.

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Bought a refurb SCH-I545 Verizon to run on Tmobile network. Created a new APN and have things working but signal is rather poor. Seems to hunt around a LOT from no signal to full signal and data 2G to 4GLTE. Not consistent at all. Many calls being missed and sometimes trying to call out, I have no signal. Tmobile is out of ideas. I think I have most settings right but something is either wrong with the phone or a setting is off.
Can anyone confirm?
I am considering rooting the phone to delete all the bloatware? I am not sure if the boot loader will be opened? I would not mind losing the Verizon boot screen and the "sim is not verizon" BS....
At first, tmobile thought the phone did not support 1,9ghz but all documents I can find say it is fully supported. Do I need some radio apps?
cobra112 said:
Bought a refurb SCH-I545 Verizon to run on Tmobile network. Created a new APN and have things working but signal is rather poor. Seems to hunt around a LOT from no signal to full signal and data 2G to 4GLTE. Not consistent at all. Many calls being missed and sometimes trying to call out, I have no signal. Tmobile is out of ideas. I think I have most settings right but something is either wrong with the phone or a setting is off.
Can anyone confirm?
I am considering rooting the phone to delete all the bloatware? I am not sure if the boot loader will be opened? I would not mind losing the Verizon boot screen and the "sim is not verizon" BS....
At first, tmobile thought the phone did not support 1,9ghz but all documents I can find say it is fully supported. Do I need some radio apps?
Click to expand...
Click to collapse
Have you tried asking in the T-Mobile S4 help forum?
If not, try posting your question here:
http://forum.xda-developers.com/showthread.php?t=2324421
You'll probably get better results.
Good luck!

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