Originally Posted by L0rdNels0n
Your screen shot points to the problem
There are NO APN settings on the phone so no data connection
Google your providers apn settings and manually install them onto the phone - it is very simple
Settings - Mobile Data - Access Point Names edit access point
Add all the correct data ( you will have an APN for data and mms they go in together on the same page, just add the info into the options needed : Note not all options require any input
No APN means no mobile data connection, OP isn't getting a signal at all.
As for the OP, I had something similar happen to me on my S3 a while back, what does your IMEI number say? If it says 0, then your phone can't read your IMEI number so the network can't register your phone and provide service. If this is the issue you're going to need to restore your IMEI.
Hopefully I'm wrong and L0rdNels0n is right and a simple APN fixes your problem. Restoring your IMEI wasn't exactly a cake walk for me.
Sent from my HTC One using xda app-developers app