I called back number 0490 290 944 reached voice mail for a charity company but did not say the name.

Missed a call from this number a few times. Tried to call back this time and no answer. Probably just another scam otherwise they would leave a message especially because it's a mobile number.

Randomly called me, when i picked up hung up straight away?. Has contacted someone i know before and has done the same thing? Possibly a scammer?

Okay just another darn nuisance.
I will never call back any number I don't know.