This really should go without saying but people do it anyway:
I’m not sure why everyone feels the need to publicly share their “business” with everyone. The worst offenders are usually chatting and not on a serious call. Are they that busy? Do they feel they’re more important? Do they need to feel important?
It would be nice if everyone tried to show others some courtesy–use your polite words; make eye contact; and give your service person your (full) attention. They are people, too! Talking on your cell while being served is essentially telling your server/cashier that they are invisible. We expect courtesy from our children yet many adults don’t bother to attempt it themselves. We all fall off the wagon (frazzled, bad day, etc.) but being polite (even moderately polite) is not that hard once you get the hang of it. It could totally change someone’s day for the better.