[AC Question]

Got an unlocked HTC One M8 and put in a Three(UK) Sim card which worked fine for the first couple of days. Great signal, data working fine.

Then all of a sudden it wont register my Sim with the network anymore, yet the data is still working and I get 4G. Just can't make phonecalls or texts. Only got the phone on Monday. sometimes it does register with the network but still wont get any signal bars. I went to a shop and they said to contact HTC but surely there is a simple way to fix this?

[anon8380037]

Hello. I am currently on a Three rolling contract since June.
Was the phone pre-owned, or unlocked from another network. Did you port your number recently. (I had to change a sim which displayed a temporary number).

Try About Device - Status and see if 3 and your number appear.
Turn off Data and search for a network in More Networks - Mobile Networks.
I have a Samsung so Settings may be different.