0907 scam ?

I got a call on my mobile 'phone this afternoon from a number I didn't recognise ( 0907 ...)

It wasn't a single ring but a call that I answered to hear a voice apparently having difficulty hearing me ... "Hello? Hello? Hello?".

Trusting person that I am, I called the number back using the 'phone on the desk. I got a message saying "Trying to connect you", followed by a ringing tone that didn't get answered.

Then I Googled for "0907 scam" and thought ... WHAT A SAD WAY TO EARN A LIVING.