If that does not work, change the Preferred network type or network mode to3G only or WCDMA only and see if it works
Try to click Reset All Networks and see if it helps
and do you have another phone to test the PM sim ? just to make sure it is not a device problem. Also, that can force a sim card re-provision and it could resolve the problem
Also, try the phone in another area if possible, it could be just a local network outage