Bel canto short message

My mobile phone is Unicom version of Cool God f 1. I don't know if it's the phone. It seems that I used this. ...

A: It may be because your mobile phone number has been used to transfer numbers to the internet, so you can't receive verification messages normally. That is, your mobile phone number was originally Unicom, and after the number was transferred to the network, it became a telecom or mobile card. This will happen to you. Solution: Replace the new card or return the card to the original operator.