Sorry to hear that. But have you tried the basic troubleshooting steps to determine the problem? If not please try to do BTS.
> First try to switch off the phone first then after 2 minutes switch it on again.
> If nothing happens, switch off the phone and remove the sim card then switch it on again after 2 minutes
>If still problem still persist, try to do sim swapping. You need to insert your sim card to other handset for us to determine if the problem is on the sim card or on your phone.
I hope it helps