Twitter can't send text messages to this number.

1. First, check whether the mailbox is full. If yes, please delete some information.

2. Secondly, if you still can't get it after deleting it, you can change the machine or card to see if it is a hardware factor.

Finally, after eliminating the above reasons, you can try to test whether it can be received in other places to see if it is the reason for the weak local signal. That's why Twitter can't send text messages to this number.