iPhone 6s issue
When I dial a particular individual’s mobile number, I receive either 3 short beeps or a message that the call cannot be completed. It is only this person’s phone. He can call me. I can text him. He can text me. I have changed SIM cards, deleted his complete contact information, reinstalled his contact information and reset my phone. I’ve checked his phone numerous times and I am not blocked on his phone. I can call others successfully on the his same network. I am with Verizon and he is AT&T. Verizon does not know what the problem is. I’ve never heard of this. Help!
iPhone 6s, iOS 13