Rang and hung up when I answered

Hung up immediately after I answered the call. Called back, it is some kind of call center but no name of company. Fishy.

Caller: Cold Caller

Calls every few days, hangs up when you answer.

Caller: Tm Mobile Phone Company

Tried so sell me some prize sim card and phone

Rang twice and hung up before I could answer.

Rang and hung up immediately when I picked up. Called back from a different line and got a "The number you have called is not connected" message.

Caller: (08) 6149 9869

(08) 6149 9869 phones every day. No one is on the line when the call is answered. I expect there will be unreasonable charges if I was to return a call to this number.

Same as previous person - Rang and hung up when I answered