1. A prompt box with wrong phone number format appears. First, you should check whether the telephone number is entered correctly. Sometimes it is inevitable to write the wrong number because of personal negligence.
2. It may be because the input method is adjusted to Chinese input method, and then full-angle input is selected. When the Chinese input method selects full-width or half-width, the symbols and numbers appearing in the input are different. So please switch to the half-angle input number, or switch to the English input method and then enter the mobile phone number.