Free startup idea: Global GSM signal strength logging service. Because telco's waste our time and the data can be pulled out of the air.
And the underlying data from http://OpenCellID.org - Nice map interface for searching
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we could do signal reports, but http://opensignal.org has that well covered (albeit with less sampling).
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Any diagnostic tools to help separate device faults from network issues and make it easy for non techies a big win!
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