How do I fix ‘not registered on network’ error on Samsung Note 2?

Yousif H August 28, 2013
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Android 4.1.2 was installed on my Samsung Note2 N7100, then I had installed a custom software CM10.2 Android 4.3 and everything went fine. Then I re-installed the official Android 4.1.2.  It worked but when I attempt any call it gives me the error “Not registered on network” and the IMEI code changes to a weird new one.  Note: when I re-install the custom software everything works properly and the IMEI changes to its original one.  What do I have to do to solve this problem? Is it about unlocking something?  Please I need help!

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