iPhone calls go straight to voicemail

Husband and I both have XR iPhones. Our calls seem to be going straight to Voicemail. We do not know why. Do not Disturb completely off. WiFi and Cellular on. He calls. I let in ring. I swipe and get a beep-beep noise but no call. He goes straight to voicemail when he calls me. Same with everyone who tries call either of us. We are baffled. Both phones worked fine when we first got them in January. Now neither one of us get any calls from anyone. The calls just go to voicemail no matter if the phone rings once or three times or whatever. Or a "fail"?