Blank Silvercard PIC16F877 + 24LC64 embedded on a GSM Die-cut Smartcard.
Do not confuse this version of Silvercard with cheaper Silvercards on the market. This card has a GSM Die-Cut SIM unlike cheaper Silvercards with crude SIM outlines drawn on in pen which you'd have to cut out with a knife or scissors. You don't have any of those headaches with this card, simply press out the SIM after programming it.
Ideal for SuperSim projects.
A selection of suitable programmers are also available such as Infinity Phoenix, Infinity Unlimited, CAS 3.
 | 
