Welcome to Android Central1 Which phone do you have? It's not an iPhone, is it? I ask because you mentioned iOS.
OMC might be OverDrive Media Console. Do you have OverDrive installed (usually used to check out eBooks from your library)? If so, uninstall it and see if the error message persists.
Carrier-specific phones usually have to be on that carrier in order to receive OTA system updates. If you unlock it and use it on a different carrier, you won't get the OTA. Depending on the phone, you might be able to update it manually using a computer-based sync program (like Samsung Smart Switch, HTC Sync, LG Bridge, etc.).
06-09-2016 05:36 PM