IPhone won't receive messages once it dies?

When my phone dies and Once I charge it again it won't receive messages that were sent once it died my girlfriend called me and Said why I ain't answering her text and it turned out she sent messages but not all of them went thru how can I fix this?

My experience with iphone is that you have to send a message once it is turned back on.

Some of my family live out in the middle of nowhere with no cell reception. If I'm out there for an extended amount of time, I have to get someone to send me a message when I can get back in reception to trigger the back log of messages to come through.