Question [Q] Unknown ID Caller

As told in title, when people call me, i can't see their name! They are all unknown! Same for me when I call someone, he can't see my name.

This bug appeared after flashing 4.4.4 with NRT.

Somebody can help me?

Thanks in advance

P.S.: tried to flash it again and make a factory reset..

Nevermind, it was the SIM... I don't know why after flashing new version is giving this problem.