Battery Drain issue - No cell Coverage

Your phone is constantly searching for a cellular signal from your carrier, and it works much harder to do this if the cell signal is weak or does not exist in the area where the phone is located.

Make an appointment at the Apple Store or take the phone to an authorized Apple service shop to have your phone checked and tested.

You can find a list of authorized shops in your area using this link:

Find Locations

Of course, your phone will probably work perfectly at the shop, so your next contact would be to your cellular carrier who will likely try to blame the problem on Apple, but since the phone worked perfectly at the Apple Store, that theory won't hold up.

Ask your carrier to send a technician out to test the phone at your house, where you are having problems.