Unlock Code, No longer Connecting.
Purchased a unlock Code for a AT&T HTC First 4.1.2
After I received code I entered it in, Device said "UNLOCK SUCCESSFUL RESTARTING". After My device booted back up, now it will no longer connect to my network, when I try to place a call it says "not registered on network" & many other network settings are grayed out, went to Settings, More, Mobile networks then when i try to go into network operators it is grayed out. Tried a Factory reset but it did not work.
Can someone please help to get it working again?