You can find one of several free apps on the Android Marketplace to look up your Android ID.
Click here to find one.
For BlackBerry devices running OS 10 or newer, you will need to supply your BlackBerry Serial Number. To find your Blackberry serial number, go to Settings » About » Serial Number. You will have to scroll down a bit to see the Serial Number.
BlackBerry (Legacy, Pre-OS-10)
For BlackBerry devices running an operating system older than version 10, you will need to supply your BlackBerry Pin. To find your Blackberry PIN number, go to the following menu options Options » Status » PIN on your device.
iPad/iPhone/iPod (iOS 6 and earlier)
To find your UDID, launch iTunes on your computer and connect your device. Select your device from the devices area on the left hand side of iTunes. In the right pane, locate the information about your iPhone in the Summary tab. Click on the serial number shown, and it will display your UDID.
To find your MAC Address, on your iOS device, go to Settings » General » About. Scroll down until you see Wi-Fi Address. Enter that value into the textbox exactly as it appears on your device.
iPad/iPhone/iPod (iOS 7 and later)
You can find one of several free apps on the Apple AppStore to look up your IDFA. To find one, search for the terms "device identifier" within the App Store and select one of the many apps that indicates display of the IDFA.