Epic Records is a music first company that breaks new artists. That is our mission and our mandate. Unfortunately, when marketing and publicity stunts trump the actual music, we must remind ourselves of our core values. To that end, effective immediately, we are working to dissolve our relationship with Death Grips. We wish them well.

"The attacks were coordinated against Sony for exercising its rights in a civil action in the United States District Court in San Francisco against a hacker," Sony chairman Kazuo Hirai said in the letter.

"What is becoming more and more evident is that Sony has been the victim of a very carefully planned, very professional, highly sophisticated criminal cyber attack designed to steal personal and credit card information for illegal purposes."

So yeah, knowing someone's ICCID can give you their full unpublished billing name, their cellular phone number (and hence their home address), their current location on a realtime basis, their voicemail, and if you're prepared to follow them around (within a few miles) then you get all their phone calls and SMS messages too.

In late March Mr Corrons was preparing for a meeting at Panda's Bilbao lab with a journalist and took a moment to dodge downstairs to get a drink. On the way down he passed two young men coming up.

One asked if he was Luis Corrons. He said yes while wondering who they were.

They introduced themselves which left him no wiser. Then, one of them said; "I'm Ostiator and this is Netkairo."

"It was then I realised these guys were the ones that were arrested in the Mariposa case," he told the BBC. "I thought they wanted to teach me a lesson."

"He got really annoyed at that moment, when we told him he was not good enough," said Mr Corrons. Subsequent discussion revealed just how poor their skills were.

"They were given the botnet with all the stuff they needed," said Mr Corrons. "Using it was like using any other program."