Cell phone interuption is a pet peeve of mine. I hate when I am in a line at the grocery store and the idiot in front of me is too busy answering their phone to finish the transaction, or having dinner with people and they stop to answer the phone, or trying to drive anymore dodging the phone answerers as well as the callers.
Stopping an important speech to answer a cell phone is just rude and stupid.
Even more annoying (and dangerous) is when someone cuts you off in traffic while they’re on their cell phone.