1. To view your devices IMEI & Serial number, swipe in from the right edge of the Start screen to display the Charm bar.
   
2. Tap Settings.
   
3. Tap Change PC settings.
   
4. To view the Serial number, from the "PC settings" screen, tap PC and Devices.
   
5. Tap PC info.
   
6. The Serial Number will be displayed.
   
7. To view the IMEI number, from the "PC settings" screen, tap Network.
   
8. Tap Connections.
   
9. Tap AT&T.
   
10. Scroll up to view the IMEI and other SIM/Network information.