The Gummint want to know which of the dangerous proles out there are talking to each other, so your mobile phone will now be registered on a database against your name, address, blood group, voting intention, exit visa etc.
It uses the IMEI number that every mobile has built in, nothing to do with the SIM card.
type *#06# into any mobile and it will show the unique number the gummint will use to tag you and listen to you telling everyone you are on the train
Download this free application before it is banned and you can change your IMEI number at will.
Fucking idiots. This really is worse than living in the DDR