SMS reminders can be delayed for a few days.

There are many phenomena of receiving delay: one is the network reason, the other is the server reason. Because of the server, if a short message cannot be sent to the target mobile phone (stop, no signal), the short message will be stored in the server for a period of time, such as calling or sending a short message immediately after you owe the payment, so that the server will receive the information and send the stored short message to you. Network reasons: the most obvious is to send short messages to this machine by fetion. I have used it several times, and it will take about 10 minutes to receive it.