The pocket spy: Will your smartphone rat you out?

"THERE are certain things you do not want to share with strangers. In my case it was a stream of highly personal text messages from my husband, sent during the early days of our relationship. Etched on my phone's SIM card - but invisible on my current handset and thus forgotten - here they now are, displayed in all their brazen glory on a stranger's computer screen.

I've just walked into a windowless room on an industrial estate in Tamworth, UK, where three cellphone analysts in blue shirts sit at their terminals, scrutinising the contents of my phone and smirking. "If it's any consolation, we would have found them even if you had deleted them," says one.

Worse, it seems embarrassing text messages aren't the only thing I have to worry about: "Is this a photo of your office?" another asks (the answer is yes). "And did you enjoy your pizza on Monday night? And why did you divert from your normal route to work to visit this address in Camberwell, London, on Saturday?"

I'm at DiskLabs, a company that handles cellphone forensic analysis for UK police forces, but also for private companies and individuals snooping on suspect employees or wayward spouses. Armed with four cellphones, which I have begged, borrowed and bought off friends and strangers, I'm curious to know just how much personal information can be gleaned from our used handsets and SIM cards."

Read the full New Scientist by Linda Geddes