I use TomTom MyDrive on my PC. As it maps congestion on even minor side-roads I assume it's using mobile phone data.
It's accurate provided you take into account that it always lags behind the current situation by several minutes at least, which is worth bearing in mind when checking what parts of your journey will be like by the time you actually get there.
In other words, you have to know the current trend - e.g. is it towards the end of the rush hour? Or is it early rush-hour and therefore likely to get worse? If your route passes a school, how close is it now to pick-up/drop-off times?
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