I'm having exactly the same issues as you. Texting and data works. Don't bother switching your SIM card, or restarting your phone. All of the troubleshooting in the world won't work. It's the new update with VolTe that has made my older phone stop working as a phone. I have to have people emailing and texting me in order to communicate. It's a really unfortunate change and I am asking PM to look into the issue.
