Why does my phone bring up Not registered on network? How can I fix this?

[Charma52]

Not registered on network

Hi All

Recently my phone brings up not registered on network, Did everything mentioned to see if it works but still does not work. Its not my sim checked this also help im without a working phone

 

[Petr Tanker]

Re: Not registered on network

Try Factory reset. And get a info about your device. (I9500,I9505 r SGH377 etc.)