Why we need MicroSIM Cutter ? a question everybody is asking these days.. Well iPhone is coming with MicroSIM card that most Network Operators are not ready for and AT&T giving MicroSIM with a complicated contract plan. It all means that most users in the market will need to cut their Network SIM card before they can use the iPhone 4..
Then Why can`t I just cut my SIM with a Scissors or Nail Cutter ? very simple answer, iPad & iPhone 4 comes with a SIM tray with a clip that clicks at both egdes to hold the SIM card together.. meaning that the MicroSIM inserted must be precise and accurate size, no room for error and that is why you Must cut with a special tool.
Another reason why it is important to use MicroSIM cutter to cut your tools is because you can always restore your cut SIM to normal SIM with MicroSIM to normal SIM adaptor. a SIM cut with scissors can NEVER be restored if you ever wish to use that SIM in another phone.
This is What a MicroSIM Cutter Looks like Microsim Cutter
This is what a MicroSIM adaptor to restore your SIM to normal looks like
More info and Video Here Microsim Cutter