Cell phones and birth don't mix

So here's the story. About 6 weeks ago we were in a woman's home helping her through the last parts of her labor. Her mom, her sister, her husband, Beth, and I were all present. She's breathing and relaxing and moaning a little, and getting really close to pushing when suddenly a loud pop song breaks the silence. Then moments later an equally loud country song adds it's tune to the only momentarily renewed quiet. Wouldn't you know it, minutes later one more loud (of course everything sounds loud when a woman is in labor) cell phone ring. Of course, the phone calls were all from other anxiously awaiting family members, but that didn't make their rings any less jarring.
Finally, all cell phone rings were turned off and/or placed on vibrate. We were all focused on our laboring Mom again, breathing, rocking, moaning, and finally pushing, when wouldn't you know it, in the midst of some good focused pushing comes an electronic mmmmmmmmm, mmmmmmmmmmmm, mmmmmmmm. The worst part, was it was my phone. Thankfully the vibrating stopped quickly, and Mom didn't seem to notice. Maybe that should be part of the birth plan now, are cell phones allowed at the birth.