Palm Treo 270 User Manual page 104

Phone Info
About
PhoneBook
Page 104
Number: Displays your SIM card's phone number.
Note: Not all wireless service providers include the phone number on
the SIM. If the phone number is not on the SIM, this field
displays "No number on SIM" instead of the number.
IMEI: Displays your communicator's equipment ID number which
uniquely identifies your communicator to your mobile service provider's
network.
Firmware Rev: Displays the version number for the mobile
communication software on your communicator.
Shows version information for PhoneBook.
Application-Specific Tasks