call and hang up immediately after I pick up the phone, or if I don't pick up doesn't leave the voicemail

Caller: Possible scammer as the same happened yesterday on a number I blocked then, they just hang up no answers

Possible scammer as the same happened yesterday on a number I blocked then, they just hang up with no answers so if it wasn’t a scammer who wants you to call back then they could have the decency to say it was a mistake