The school short message service has been opened. What should I do if I can't receive the text message?

(1) Ensure that the school newsletter service opened by the mobile phone is within the normal validity period. (2) The mobile phone model does not support the SMS function; The mobile phone number does not belong to Guangdong Unicom users or the balance of the user's mobile phone card is insufficient to receive short messages; The message was lost because it was not turned on for a long time. (3) Misdeletion: As the received SMS number is a service code (not a mobile phone number), it may be mistakenly deleted as a harassing SMS. (4) If the above reasons are not ruled out, please call the school newsletter customer service center to verify.