How to accomplish this:
http://www.cnn.com/2007/TECH/ptech/11/19/rogue.cell.phone.ap/index.html?iref=mpstoryview

Single-phone-multiple-attack method:
1) Acquire an old cellphone and remove the SIM card if it uses one.
2) Attach it to a computer with appropriate cables
3) Perform a Restore Factory Default
4) Change every code you can find (IMEI, Serial, etc)
5) Dial 911 at will. It will work because all phones are required to be able to dial 911 whether its registered or not

Hints:
-On some non-flip nokia phones, such as the 3595, you can lock the keys (Menu *) and then type 0 8 DIAL to call 911 without unlocking the buttons.

-Older analog phones still work on many networks, and you can often change their serials on-phone.