iPhone 13 Won’t Receive Verification Texts? Here’s the Answer.

My iPhone 13 Pro is receiving all text messages, even SMS. I just can’t receive the messages where they send you a “one-time” code to verify for your phone number and identity. I sat on the phone with my carrier T-Mobile and Apple for multiple days. I read a reply comment on a thread related to the same question and got my answer. Even though my messages “filter unknown senders” setting was turned off; once i turned it on and back off, the text Verification Codes was going through to my phone again!