We featured this Binatone Mimo Mini Mobile in a deal the other day, but it’s worth mentioning again since Argos has dropped the price from £14.99 to £9.99. Sweet.
The Binatone Mimo Mini Mobile is the size of a credit card, and is pretty old school in that all it can do is make calls and send texts. Ideal as a cheap back-up though.
(Thanks to chillbill at HUKD)