What happened when I changed my mobile phone number for the second time and didn't receive the short message from the Admissions Office?

I changed my mobile phone number for the second time in the postgraduate entrance examination, and then I entered my mobile phone number because of the full-angle status of the candidates, but I didn't receive the short message from the Admissions Office. According to the relevant information of the query, if the candidate fills in the mobile phone number of the postgraduate entrance examination in a full-angle state, the system will not recognize it, resulting in the inability to receive the short message sent by the Admissions Office. Candidates are advised to switch the input method to English (half angle) when filling in the mobile phone number.