The original number has been changed, and the new mobile phone cannot receive information such as network check code. What is the reason why other short messages can be received normally but are a lit

The original number has been changed, and the new mobile phone cannot receive information such as network check code. What is the reason why other short messages can be received normally but are a little slow? You can apply for a new card from the operator. I haven't used Cato, but after I put it in, I looked at it and left a gap. It's not as perfect as a mobile phone card. As for the network settings, you can download a Haizhuo to try. The reason why I feel slow is the problem of the card, because it is a copper connection. If the connection is not good, it will definitely affect the effect. I hope I can help you.