There can be many reasons for no network, wrong modem is unlikely as most (not all custom roms leave your existing modem). Are your imei and serial numbers intact, APN and network set? Has your handset been tampered with previously, e.g patched for efs problems or lock patched?
Try reading the efs 'know this stuff' for more clues.
Sent from my GT-I9300 using Tapatalk
Note: This quote doesn't automatically apply to everyone, decide for yourself if it might apply to you.
Originally Posted by justruss
What has this place become?
It's essentially a few people graciously answering the same repeating of immature, lazy, demanding questions from the masses.
Nobody searches. Nobody reads the first posts or titles of threads. Nobody even looks at posts a couple above their own.