Why can't I connect to my mobile network with my s6?

[AC Question]

My phone has lost all connection to the mobile network (virgin). I've tried a new SIM but still no mobile network. Tried manually adding network but this doesn't work either. Any clues please?

 

[B. Diddy]

Welcome to Android Central! Is this a phone you got through Virgin, or from somewhere else? Have you spoken with Virgin about this?