[Q] calling over wifi and 4G - Galaxy S III Q&A, Help & Troubleshooting

Hello all,
Just got my new i9300 and made my own mini-sim from my SII and I am up and running...well sort of...I am using TMO USA as my carrier and this is a new i9300.
My questions are:
1. How do I get calling over WI-FI and 4G... I am only getting Edge grrrr... is where I need to install a rom? Comments / suggestions are greatly appreciated.
Ciao~

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Is 4G LTE working for you now?
alsamahi said:
Hi guys,
I bought Samsung galaxy S3 from Korea unlocked, (SHV-E120S), I am trying to use the LTE in UAE however, it seems SKT Korean telecom company locked the LTE, we have the same LTE frequinces here, I have tried to use hidden menus in order to choose the proper options to switch LTE on, however no hope.
Can any one would advice me please?
Click to expand...
Click to collapse
Hi - could you help me by mentioning whether 4G LTE is working with you now in Dubai? I am planning to buy an S3 and would prefer an LTE but not sure if it works here !
Since you have a localized version of the S III, can you help me with this:
http://forum.xda-developers.com/showthread.php?p=33771263#post33771263

[Q] TMO USA Modems

Greetings,
I live in the US, my carrier is TMO and I have the international i9300. I rooted it and Rom it from a ROM in this forum. This SIII is working like a champ, however I am only getting Edge and sometimes HPSA.. I was told it had something do with file size , etc...to see if would work. Any information will be greatly appreciated.
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