Welcome to 2014..... get over it! What's the difference between me talking to someone next to me in line or on the phone? None..... PLUS it's not your concern what another does in line, sit there, shut your pie hole and listen to their conversation or don't but who the hell are you to tell others what they can and can't do? People such as yourself really need to adjust to the times..... can't keep up then lock yourself in a bubble and hope the 1950's come around again.
Tried adding this but it didn't take..... Is it polite to speak to the sales person? Sure and I do....I'm able to do more than one thing at a time like be on the phone with someone AND acknowledge another person. I wound't stop talking to a person that was next to me while paying for something so why should I stop talking on the phone to that person? Times change and so do the social norms.... one can be polite to another person AND be on the phone with another.
You are the worst person in the world. Besides, you don't need to hang up, just hold the iPhone next to the reader and BAM you paid. But you shouldn't be on your phone, welcome to polite society (still exists even in 2014)