An increasingly common scam is to get the "Phoned from" number to match your bank, eg the number on the back of a credit card, or HMRC, BT etc.
So they make calls which you don't get time to answer, then call and say they've been calling from xxx bank, and you say "oh, yes I saw those", and while you're comforted by how clever you were to check the missed calls'numbers, they wind you in.