Call came in but I was busy on another call, so didn't answer. When I returned call, line was busy.

missed call

Me too! As soon as I answered they hung up.

Hang up call.

hung up.

Missed call from this number

Answered, call hung up immediately. Weird.

Also had a missed call from this number on my mobile.

said hello, caller hung up; nothing said.

Call received, I answered and then silence

spam

Call came in, hung up immediately

They called my mobile, I didn't answer as it's an unknown number and I'm tired of even the charities I already support nagging me for yet MORE money. No message was left, surprise surprise. As far as I'm concerned, that's a spam caller.

no answer in pickup. rather suspicious.