iPhone in ottercase, center jersey pocket.
I use mine to run strava app, get myself un-lost with the mapping app, call for SAG. I use the phone as a pager when I am on-call and indicate that I prefer text messages instead of voice calls.
A guy crashed on one small group ride I was on. He cracked his helmet and had a concussion and a broken collarbone. Temps were approaching 100F and he was getting dehydrated out in the sun (no shade). He got a 60-mile ambulance ride.
He was too incoherent to use his phone, but his cell had his dad's phone number which we were able to find and use.
I stayed at the scene with his bike, we called another cyclist who was already at the ride finish w/ a pickup truck to come sag me and both bikes; and made arrangements to get the bike to the dad.
Lots of phonecalls were made; and we were glad to have the ICE numbers for our fallen friend.