Banning tiny phones is stupid. These people have already shown that they don't care about the law - that's why they're in jail[1] and having a cell phone in prison is already not legal. What's it going to be now? Double plus unlegal? Surely faraday cages and cell-phone jamming would be easier and less restrictive for regular people. (The BBC article says they're changing legislation to allow them to block signals in…
All that's just my guess, I'm not really advocating the ban, I'm just trying to think from other points of view.