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27th March 2014, 03:07 AM |#1  
OP Junior Member
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I recently purchased an i9305T 2nd hand but I am continually getting network errors with my Vaya (Optus) Sim.

I have not been able to get mobile data to work at all, using various configurations.

I have tried flashing a custom rom (CM Nightlies) and flashed various modem packages but still the same problem. I can send & receive texts and calls for a few mins, but then it comes up with network unavailable and nothing will work.

I'm not sure if the phone is locked, and at one point I figured it was locked so I purchased an unlock code but I can't use it as I am unable to use ANY USSD codes (I have tried heaps) except for the one to check my IMEI (Which is fine).