I've increasingly noticed that when I call certain friends / family, I'll also get their DH/DP/other family members chipping in to the conversation, so I can only assume they have the phone on speaker at their end.
I get that speaker is more comfortable than holding the phone to your ear, and sometimes having other people joining in can be quite jolly (although sometimes hard to catch what the random other person is saying if they're not close to the phone) but equally it can be a bit disconcerting if I'm not expecting it.
It's not like I always call to discuss private matters, but sometimes I'd just like to know if I'm speaking to the whole room! AIBU?