Stupid Phone

How can we put men on the moon but I can't seem to get a cell phone that works when it should. My phone has been turning on and off all day. It only works half the time. I can see that I have voicemails but I can't listen to them for some reason. And since the phone shuts off I can't even tell what calls I've missed. At this point it won't even stay on when I turn it back on. It will load up, beep that I have voicemail and then shut right back off. I've taken the battery out and put it back in and I've charged it. So who knows what is wrong with it. Any ideas how to fix it between now and Monday when the phone place opens back up????

Jessie