My bad, I didn't see you accidentally made 2 threads.
Flash back to stock. Then try the dialer thing. The data issues could be because it is a 4.4 ROM.
Flash back to stock, try dialer code, and use stock for a bit. Then if coverage doesn't improve, it could be the towers. They may be doing upgrades in your area.
Sent from my fixed Sprint Galaxy S3!
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Devices: Evo Shift 4G (Dead) - Evo 4g (OG) - Sprint LG Optimus S - Sprint Galaxy S3 - Sprint Optimus G (LGOG) - Google Nexus 7 (2013)
ROM: All running Stock or some form of Cyanogenmod. (CM7, 10, or 11). Except the Galaxy S3, it has some Wicked Sensations.
Current Devices: Sprint Optimus G, Google Nexus 7