Re: This is a good thing for smart criminals
They can also check your browsing history during this time. but there won't be any... hence reason to believe you did not have your phone with you.
How long is it going to take to knock up a script on your laptop that browses ElReg for a couple of hours whilst you're doing the deed?
My old phone ran Perl. It wouldn't be tricky to have the phone create some browsing history as an alternative.