Hello, can't you send a text message to the cell phone that is turned off?

When the other party's mobile phone is turned off, sending a short message to his mobile phone number can be successfully sent normally.

But the other party needs a normal number and can receive information in order to receive the short message you sent him.

In addition, the retention time of SMS in the system is 48 hours. If he hasn't turned on the phone during this period, the mobile phone number of the short message recipient can't be received normally.