老千在粤语中意指骗子，尤其是指使用变化多端的手段，针对受骗者的心理和信念等施行骗术者。
Scam tactic. They will call you, once you pick up, they will hang up the call. This is to track if your number is still valid in their “database”. This is how they know who to send messages/ scam calls to.
Call and hang up, expecting me to call back??
A complete scam. Do not reveal even your full name or any particulars. This caller is good at tracking down a lot of things with just full name.
Scammer