How long is the SMS valid without turning on the phone?

The validity period means that the SMS center guarantees that the message information will not be lost during the validity period, if the other party turns on the phone within the validity period.

Make sure to send the SMS message to the other party. If it exceeds the validity period, the SMS center cannot guarantee that the SMS will be sent to the other party, but it does not mean that it will be invalid! If possible, send it to the other party.

Validity calculation method:

00— validity period TP-VP(TP- validity period) vpvalue (&; H) the corresponding validity period is 00 to 8F (VP+ 1)*5 minutes, 90 to A7 12 hours +(VP- 143)*30 minutes, and A8 to C4 (VP-166) */kloc.