How To Unlock Handspring:

Model:  Treo 180 & 270

1.    Switch ON your phone without SIM Card

2.    Enter *#*#Unlock Code#

Model:  Treo 600 (Unlock method 1)

1.    Insert an authorized Sim Card and turn ON your phone

2.    Menu and select "Phone Tool" or "Phone Application

3.    Enter on Virtual Keyboard *#*#Unlock Code#

Model:  Treo 600 (Unlock method 2)

1.    Insert an unauthorized Sim Card and turn ON your phone

2.    Enter the Unlock Code