I’ve been having an intermittent problem for months. Incoming calls go directly to voicemail. During this time, I don’t receive texts, either. This happened again last night. I have two phone numbers on my account. I have two iPhones… an iPhone 7 running iOS 11 and an iPhone 6 running iOS 10. I swapped each phone’s SIM card and tried calling my number from a neighbour’s home line. It went straight to voicemail. Then I tried calling the second number on the other iPhone and it rang. Clearly the problem is not a SIM card or either iPhone. The problem number has a new SIM card. Settings on each phone are not preventing sending or receiving calls and texts. One telephone number works perfectly fine. I’m exhausted and no longer know what to do.