Solved! Samsung J7 Sky Pro calling & messages stopped working

Dec 31, 2018
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In Nov. 2018, I purchased a Samsung J7 Sky Pro (2017 I believe) from Tracfone. It has been working fine until a couple of days ago.

The unit cannot send or receive messages nor can it call out or receive phone calls. When attempting to make a call, the phone immediately hangs up. It will, however, send and receive e-mails.

Model SM-S727VL
V 6.0.1
Software up to date
Not in airplane mode

This is what I've tried:

Soft reset - no change
Hard reset - no change
Safe mode - no change
Removed battery and reinstalled - no change
Wiped cache in recovery mode - no change
Swapped SIM with identical phone (also purchased at the same time) - error message: "Mobile network not available" on both phones
SIM card contacts and slot appear undamaged

I would appreciate any assistance you can provide.

Thank you,
David Storgard