I'm sorry if my question is kinda dumb, I already looked in the forum but I can't find an answer or someone experiencing the same issue.
I recently got a GS3 SCH-i535 which I'm currently using with Movistar from Mexico.
I configured the APN and I can't get 3G or 4G to work, but it works fine over EDGE. The problem is that when the phone is receiving data over EDGE I can't receive phone calls and I think messaging is not working either. The problem ends when I turned off mobile data, everything goes back to normal.
I already unlocked the bootloader, rooted the phone and flashed it with BoneStock 4.3 to see if changing the ROM fixed the problem... the ROM works like a charm, but it didn't solve the issue.
Any ideas or is this something I'll have to live with the rest of my life?
Thanks in advance