How are you going to show to him that the messages appeared after it was too late. The phone usually records the time the message was sent, not when your phone picks up the signals from the cell phone tower. Either way you're gonna have to reason with him. You mesages only appear when there is service in the area. There's been plenty of time when my phone didn't show any messages untill I actually called my inbox to find there were some. If you're in a poor coverage are I would double check your inbox when you're on reserve.