Caller: Telemarketer (Potential Scammer)

Calls and immediately hangs up.

I called back hiding my number in which they give you the option to opt-out by pressing '9' on the keypad. I personally wouldn't trust it in-case it is a social engineering/scamming tactic to encourage people to press a key to "opt-out" when you could be signing yourself up to something more sinister.

Ditto - but i didnt call back...

Caller: Telemarketer (Potential Scammer)

Calls and immediately hangs up.

Hang up caller, Time waster. Possible scam

Had the same thing call and immediately hangs up once answered.

Didn't ring for long. Didn't leave a message. Not keen on the idea of calling back.

Marketing and sales company.

Scam acting like free Light Bulb Replacement. While talking to the phone, the guy was asking my daily timetable, When I will be at home and When I will not and asking my home address? When I asked him back, why he needs my home address, he replied me, they are arranging to replace my house light bulbs for free. I told him, I never request and how he is arranging my house bulbs replacement when I am not in house? He could not answer my questions and got very angry. He sounds like a thief.