Just in case you were thinking of buying one of those 40 iPhone 4s that were most likely looted in the UK riots and put on Craigslist, don't—UK networks are blocking all stolen phones, so they'll be worthless.
Macworld spoke to several UK networks about the issue of the stolen phones, with the general answer being that they'll simply check stock records for each ransacked store, and add the IMEI number associated with each phone to the Equipment Identity Register which will block them from working with SIM cards in under a day. Within two days the phones will also be banned from being used on any UK network.
Sellers of stolen phones will likely still try and shift them onto unsuspecting buyers, meaning anyone who's been thinking about buying a brand new iPhone, BlackBerry or other recent model should probably go by official means only for a while, unless they want to end up with a very expensive door-stopper.
It's likely that once sellers realize their stolen goods aren't any good in the UK, they may try and sell them overseas, but this will obviously involve more hassle for the sellers and little reward. Anyone want a new door-stopper, perchance? [Macworld]