What should I do if I enter the wrong mobile number?

If the number to be sent by iPhone is too long, () will be added in front, and 1069070069 will become (10)69070069. iPhone regards this 10 as the country area code, so the sending fails. I deleted the one saved in the address book and the number changed to 861069070069, so the sending was successful.

1. Open your phone, find and click "Settings" on your phone.

2. Click "General".

3. Find "Recovery" and open it.

4. Click the "Restore Network Settings" option on the page.

5. Verification is required and the required password must be entered.

6. Select "Restore Network Settings" in the pop-up option to send the text message successfully.