A number of years ago I was standing somewhere, probably at a bus stop, and a young lady started chatting on her phone. So I moved away, but she followed me, so I moved again, and again she followed me, until eventually I had to ask her to stop doing so. She was apologetic but had been completely oblivious to what she was doing. I can't abide listening to people's phone conversations in public. I had a former friend who would say "do you mind if I take this call?" and then take it, even though I replied "yes". Afterwards I told him I would appreciate it if he'd at least walk away when doing so, but he just carried on doing it. He's no longer a friend, not for this reason, but it's another benefit to longer having to put up with him.