How long has the mobile phone been turned off?

The default value is 48 hours. If your mobile phone is set short, just follow your settings. The number of days can be set on the mobile phone. For example, my mobile phone can store 1 hour, 1 day, 7 days, and the maximum value (see the settings of the SMS server). When the sender sends a short message, there is a time limit setting, such as 2 hours, 6 hours, 12 hours or 24 hours or no time limit. Your friend's mobile phone may have a shorter time limit. 2