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Launch the Mighty app and connect to your Mighty, go to the HOME tab (bottom-middle button), go to Settings (upper-left ☰ button) then tap on ABOUT. If unable to connect Mighty device to the app, you can find the serial number under the clip (for Mighty Vibes), or right below the notch on the clip (for Mighty 3s). Mighty Vibe serial numbers start with "MPX", while Mighty 3s start with "MQU"
Your phone's brand and version number
The version of iOS or Android that your phone is running