In the process of trying to get Volte enabled on my phone I dialed *#*#4636#*#*. Then selected Phone Info and IMS Service Status.
IMS Status shows "IMS registration: Not registered". A little googling says that is not good.
I’ve tried turning my phone on/off, airplane mode on/off, remove/reinstall SIM.
How do I fix this? FYI my SIM card is more than 5 years old if that matters.