How to Hack SIM Cards for Mobile (Cellular) Phones

Do you want to modify your SIM card (Subscriber Identity Module)? Here are links to free hacking guides. If you have written a tutorial yourself (or if you know of a report not linked here), please submit a new entry.

Dual-SIM	How to cut a single SIM card into two halfes for Dual-SIM (in German).
SIM Card Reader	How to build a SIM card reader: parts list and schematics (in German).
SIM Card Earrings	Keep all those old phone call memories close to your ears.
SIM Card Cutting	There are two sizes of SIM cards, the only difference is the plastic holding the card. If you have a large card (credit-card size), and need a small one, it is possible to cut the plastic to make it fit a small size holder. The reverse of the process is trickier, but also explained in this HOWTO.