Slip your SIM into a plastic sheath, WIPE international call charges

Nano, Micro or Mini?

A sticker slapped onto a SIM card can cut international calls by 98 per cent, and guarantee a 50 per cent saving on business spending, without changing numbers or phones.…

via The Register - Networks

http://go.theregister.com/feed/www.theregister.co.uk/2013/10/16/sim_condom_wipes_international_call_charges/