Fraudsters hitting a new low

I have my GC staying here this week. I was hovering this morning when my 11 year old GS got a call on his mobile. He was allowed a mobile when he started new school last year as he walks home. Not unusual for one of his friends to call him when he is here. However I noticed he wasn't saying much & looking a bit puzzled so I asked him who it was & he said he didn't know but he was asking questions. I told him to hang up immediately. It turns out this man said he had been talking to GS's Mum about getting discounts at shops & he could not get hold of her but if GS could give him a bank acc .no. he could activate it for her. We blocked the number so he could not call again & we had a LONG talk about fraud & what these B*****ds will do to get information they can use.
GS knew about not talking to strangers either on phone, online or in person but as he said he had been talking to his Mum he was not sure if it was OK or not. Obviously he has no clue about their banking arrangements anyway.
Very disturbing that they could sink so low as to try & involve a chid but nothing surprises me. In the long run it was good we had that talk & he is now a lot more aware of how these people work but I was appalled & very upset that my own GC was targeted in this way.
Might be worth a chat with your own GC about this. Children are programmed to trust adults & they can be fooled into believing them- especially over the phone which seems so impersonal & not at all dangerous.
I expect it was just a random number call & he did not know a child would answer but it was very upsetting.