I just noticed this happening a few days ago and I have tried all options (sim check, restarting phone, wifi calling, turning on/off airplane mode, etc) I can call all others but this one person (who has an iPhone 11) I van received their incoming calls just fine. Just cannot call them as it would go straight to voice-mail. Is there anything else I can try beside getting a new sim/phone. I am trying to also avoid restoring my phone as well. Thank you!
This situation applies to me too. My sister has an Iphone. I can call everyone but her and it goes to voice mail. She said I'm not blocked but something is wrong.