How long can I send a text message after my phone is turned off?

What is said upstairs is not comprehensive.

It depends on the setting of the retention time of SMS sent by the other party's mobile phone. For example, my mobile phone is set to one month, that is, the other party's mobile phone is turned off, and my short message will be sent to him as long as it is turned on within one month, and he will receive it.

The set time is divided into 2 hours, 8 hours, one day, one week, half a month and January. The reason why it is divided into several files is that most short messages are time-sensitive, and it is useless to send them after the deadline.