Phone cannot make or receive calls
I have an unlocked Samsung Galaxy S9+ that I bought already unlocked at Best Buy a few years ago. I was able to receive a phone call last night, but today I can't make or receive calls. My internet, etc. work and I can send and receive texts but not calls. I called customer service from my work phone and she tried all she knew but nothing fixed it. I restarted multiple times, even tried safe mode, nothing changes. I got a new sim card. The rep used my phone to make a call and it worked. I got to the parking lot and tried to make calls but couldn't. I went back in the store and he said there's nothing else he can try. I spoke to another customer there who had an unlocked galaxy S10 doing the same and that he had to get a new phone.