Useful facts about the iPhone SIM card
Fact 2. You can create an iPhone SIM card out of a standard SIM card using a simple method.
To do so, you will need a standard SIM card, a pair of sharp scissors, a ruler, and your skillful hands. Although the process is simple, you must be very careful while performing it so as to not cause any irreversible damage to the SIM card.
To get a standard SIM card to fit into the iPad or iPhone 4's micro SIM card tray, you can use the free PDF/Paper/Scissors solution from Macnotes instead of purchasing one of the overpriced SIM card punching devices or adhesive stencils for sale on eBay. Here is how you use this useful tool to create an iPhone SIM card from a regular SIM card:
The MicroSIM Cutting Howto-PDF manual features a print of a black stencil. The outer outline of the stencil represents the size of a standard SIM card, while the inner outline represents the size of the micro SIM card that the iPhone 4 and iPad use.
Print and cut out the stencil. Once you have precisely cut it out, glue the stencil to the back of your standard SIM card. Important: make sure to glue it to the side that doesn't contain the chip's contacts!
Cut the black area off. Do not worry about the fact that the edges fall partially on or over the card's border, as the important electronic parts are located further inside of the card.
Be very careful not to cut off all of the plastic. If you cut it all off, the SIM card will rattle around inside the iPhone compartment and will not work. There must be some plastic remaining.