The NYTimes has an article on the cellphone (i.e., Iphone) as a universal remote.
On its blog, there's a suggestion to convert cellphones into the SecurID device. As it says: "For those of you who don’t work for security-conscious corporations, a SecurID is a little LED display that goes in your wallet or on your keychain, that flashes a different six digit number every minute or so. You need to enter that number, along with a user name and password, to get into some computer systems."
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