The pic above, taken from Nokia Energy Profiler shows first a short GSM call taking 0.9W and then a similar 3G call taking 1.35W in Helsinki city centre. In other words, a huge difference. My friend Mika who was in charge developing that particular app reports that a standard battery that would last 3 hours with 3G would last as much as 4h 45min with GSM! That’s also the main reason why my iPhone is running GSM – and I’m quite ok with that. Greenies will also conclude that 3G is not good for the environment…