You can find the IMEI code of your phone at least using the following options
Option 1:
Press Tel to start the Telephone application.
Press Ctrl+P. A window will open up presenting the IMEI code. You can close the window by pressing OK or the Enter key
Option 2:
Press the Tel button to start the Telephone application
Press the Menu key. Use the Arrows key to move to Tools menu.
Select Tools|Serial number (IMEI) and press the Select button or the Enter key. A window will open up presenting the IMEI code. You can close the window by pressing the OK button or the Enter key.
Option 3:
Type *#06# using the keys on the front of the phone. The serial number (i.e. the IMEI code) of the phone will be displayed on the screen. You can clear the screen by pressing the selection key on the upper-right corner of the keyboard on the front of the phone.
Option 4:
Remove the battery of your Nokia 9210 Communicator. The 15-digit IMEI code is printed on a sticker underneath the battery.