My short message can't be sent, and the old prompt didn't add the recipient, and it can't be sent on other machines.

I have encountered this problem before. At that time, the M-Zone card was used, and the mobile phone was GD88. When sending messages to others, as long as the other party is a Nokia mobile phone, they will not receive my message, and other brands will be fine. There was no similar problem when changing the card to another mobile phone, but the problem lasted for about half a month and then returned to normal. I also called 1860 for consultation. They said it wouldn't be the card, so let. I hope your problem will be solved soon ~