You can get your IMEI number of your Symbian phone in a few ways.
1. From the Standby screen of your phone. This is the screen that shows your service provider name along with the date/active profile that you are using.
Now type in Star, Pound/Hash/Number, 06, Pound/Hash/Number.
At this point, the IMEI number will be displaied and the screen reader will read it.
To reread the screen use Talks select for Talks and Command Star for MobileSpeak.
2. The 2nd way is to connect your phone to your PC using PC Suite mode.
Now go to the Nokia Phone Browser on your PC and find your phone. Do not press enter on your phone name.
On your PC, Do a ALT+Enter to bring up the phones properties. This will contain your IMEI number along with other information about your phone, like firmware version, date of the firmware and so on.