What a load of political nonsense!!! There are probably thousands of devices that could be used to trigger an explosive. Next you will be suggesting that a valid photo ID, bank account information, address and thumb print be required to post on Free Republic.
If you're that insecure perhaps you should find a secure closet to hind in.
none of those remote detonator type of devices are as easy to use as an anonymous activated cell phone purchased for cash.
and in addition to the detonator angle - these phones can be used for communications, also in an untraceable manner.