Texting/talking on Cellphones while driving.

The main purpose of my cellphone is for emergency commucations and business, but I don't use it when driving (anymore, got 1 ticket late 2009 when talking with one of my business accounts while driving).
Now my phone is usually off after working hours. If somebody calls and leaves me a message, I'll call them back the next day.
My grown kids are constantly checking their phones even when they come over to visit or when we go out to dinner. I don't get it.
One of my stepsons has his phone rigged so he can talk on it through a helmet mike while he's riding his motorcycle. Way too dangerous IMO. I ride too but only carry my cellphone in case of an emergency while riding - no way would I even want to be distracted while on 2 wheels.