Hubby is terrible at answering his phone!!

I'm 37 weeks 2 days and everytime I text or call my husband he doesn't see it until hours later. He has the sound all the way up and has changed the notification ringtone and I can hear his phone going off just fine but he can't hear it. I'm terrified I will go into labor and he won't know because he won't check his damn phone! Ahhh it's so frustrating! What do I do??