Network not registered samsung n7100

Before you guys answer this just from reading the title, I have put a lot of different custom roms on my phone, android Revolution HD 31.0, Cyanogenmod, it was fun. But lately my phone stopped recognising my sim card. I got my friends and other people to put their sim cards into my phone as well but it kept saying 'Not registered on network' or something like that when I tried calling or texting someone. Another thing is that when I go into options > mobile networks > network operators and pick the network it says 'Network unavailable'. Carrying on from this I went to see if I had an Access point names for these networks, I did, I even check if they are correct but to no prevail. I have tried these cards: EE, virgin media, Lebara, O2, vodafon, another card of EE. All of these didn't work, my current system is the 4.4.2 KitKat from Android Revolution by mike1986. I think it might be that it is because the system is kitkat and not jelly bean, I honestly have no clue.

PLEASE, do not say the usual things anout the solution to Network not reistered because if searched it all up and nothing worked, such as the APN.

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