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It had stock 4.0.4 -> could call.

I've flashed FoxHound ROM -> after a while, when I try calling, it says "Not registered on network" .

Tried GalaxSim, but everything looks ok.

Restored back to stock and tried another SIM -> same error.

Do you have any clue? I cannot make any phone calls, nor access the internet.

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if you press *#06# on the dialer do you get your imei number? – Iakovl Dec 13 '12 at 14:53
@Schutzstaffel have you got the solution to your problem, I face the same on my samsung galaxy chat. It used to work even after official upgrade, but suddenly stopped working and gives me the same error as in your case. – shivshnkr Aug 23 '13 at 2:31

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