[Q] Unlocked phone connects to phone network under stock ROM but not custom ROMs

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http://forum.xda-developers.com – I had my S2 unlocked via software while I was abroad to use the local SIM card - the person who did it couldn't unlock it, first blaming the phone as rooted and then hardware as damaged. Instead they made it worse, the phone doesn't connect to any network, whatever SIM card I use. At the time I was using a rooted custom ROM (Rootbox) v4.2. I found if I use a stock ROM, even if rooted, it connects to phone networks and is unlocked to any SIM card. As you may know, the S2 can only upgrade to v4.1.2 if stock. I have been going around in circles trying different kernels and ROMs. I would rat (HowTos)