Jul 19 2010
Easy Way to Activate iPhone Without Official SIM
If you are not using an official SIM (say, the one from AT&T), you should be very familiar with the below message shown in iTunes when you connect the iPhone to your computer:
The SIM card inserted in this iPhone does not appear to be supported.
Apparently, you can use PwnageTool or Redsn0w to activate the iPhone [...]