I wonder if anyone else is having this problem. There are some post on Samsung's forum but no solutions. People are switching to iPhone.
This problem just showed up after owning my Galaxy S10+ phone for under 2 years. I never had this problem before. I spent 5 hours on the phone with two different Verizon Tier 2 reps and they went through all setting on their side and my phone and found no problems. They say the next step is to do a complete reset of my phone but after reading the Samsung posts I don't think that is going to help. It is completely intermittent. I can get a call that comes through and 10 minutes later the next call goes to voice mail. After that all calls will go to voice mail until I reboot the phone. Then it works again for a while. This happens in different areas so it is not an area problem or tower problem.
Samsung Post:
https://us.community.samsung.com/ynzzy74688/board/message?board.id=get-help-phones-galaxy-s-phones&message.id=66258#M66258