On your device, go to Settings > Bluetooth.
Locate your mPOP’s serial number in the Bluetooth devices section.
The serial number can be located on the underside of the mPOP, or on the box in which your mPOP came in.
Format: STAR mPOP-CXXXX, with the last four digits representing the last four digits of your mPOP’s serial number.
For Android devices:
First, open the Settings app.