I received a text message four days after I left Guangzhou.

If you didn't receive the SMS after successfully filing in a different place in Guangzhou, it may be because the hospital networking system didn't send the SMS in time or your mobile phone signal was not good, which led to the failure to send the SMS successfully. You can try to contact the hospital or relevant departments to confirm whether the filing has been successful, or inquire about the filing details by other means. In addition, if the mobile phone number you provided at the time of filing is wrong or not your own, you may not be able to receive SMS.