I agree. I think that rather than mindlessly taking all calls, we need to practice the same sort of etiquette that we use in our homes when the landline phone rings and we have company. We tell the caller on the other end, "I have company, I'll call you back" sort of thing (and then write yourself a note to return the call!!!).

I'd do the same thing in the line at a cashier. I'd not pick up if I was approaching the cashier (unless kids/DH) and then I'd hold back from getting in line. If I was already in a conversation, I'd say, "if we need to talk some more, I can call you back in a few minutes". All of this can be done before getting in line!!!

It's courtesy and respect for those that we are face-to-face with that seems to be missing. As jeanief said so well, the cashier is not a robot or a piece of furniture.

I use Tracfone as well so it is well known amongst my friends and family that my cell phone is for emergencies only.