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This is an open web app, targetted at Firefox OS and tested initially on the Geeksphone Peak, that grabs the current cellular network ID (the MCC, MNC, LAC and Cell ID) and displays them.
The app will also, optionally, upload this information to OpenCellID.org, Mozilla Location Services and/or a custom URL.
Once the app is running, it should, as long as you have a SIM card in your device, immediately display your network, Cell ID and LAC, MCC and MNC information.
To configure reporting to Mozilla Location Services doesn't require an API key at present; you can, however, enter an optional "Nickname" and you will then find that your reports appear on the Leaderboard credited to you.