I just dealt with this today. My Note II wouldn't call or receive calls (but text, data, and MMS worked fine). It's NOT the APN. No APN would make data and text fail (tested it myself)
It's likely they're enforcing VoLTE on you. I always thought VoLTE was also needed for SMS but apparently not. I just tried three other phones, one a LG Lucid 3 (2014), a Pantech Breakout (2011) and my S4 Mini (2013) and they all text, had data and could do MMS, but no phone calls. Under Settings-->About Phone-->Status everything checked out except one bit:
Mobile Network:
Unknown
That one part right there. It should say "Verizon Wireless". On the LG, it showed 'searching for service' despite it having all bars and 4G LTE. Texting still worked. MMS worked. Data worked.
The clue was the Pantech Breakout. It showed 'no service' as the carrier, and it had additional details regarding what it used for voice, and it was 1x. the status of 1x was zero. Nothing. Seriously, we have had 1x for years (and 3G, it actually connects to 3G at work!) but apparently today they finally shut 'em down. Took 'em long enough. My Galaxy S5 works, and it has HD voice (aka, VoLTE) same SIM and all, so it's a VoLTE thing. Verizon did say they delayed the shutdown of 3G 'indefinitely' and haven't issued an update yet but I guess they finally got the ball rolling. They were maintaining pockets of 1x/3G also for M2M and IoT systems as well, and if I went scanning, there are still small slivers of 3G left around here, enough for that 'unknown' network to show 'verizon wireless' where it remains until you restart the phone, but despite that I still couldn't call or receive calls on those phones. Oh well, at least I can still use the most feature-packed phone around, the Galaxy S5. It needs a battery though.