Call me suspicious, but there is ALWAYS a motive. People just do NOT ever *just* call.
Extended Family-wise and Friends, they have either been nosy about something, such as a latest purchase, or to just simply boast about a recent investment or purchase of theirs and how it apparently beats something that we have.
Girls tend to have a motive such as dropping hints, or doing some dirt-digging.
Blokes tend to want something, usually borrow something of yours, or requiring your expertise for some task in the future.
Immediate family are looking to kill time, have a gossip, drop a present off (or remind you of a forthcoming event where YOU will need to bring yourself and a present!). Or just have a rant.