WIFI Vs 3G BATTERY USAGE

It all depends on the signal strength. If you are in the area where 3G is good but a weak wifi signal, wifi  will use more energy to remain connected. and also, if wifi signal is full and 3G signal is weak, using wifi will yeild better battery life. If both signals are robust, then using wifi will effectively use less energy if you are using your phone actively.If you are a passive user who is not streaming media or chattting or anything...

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Why does 3G mobile cellular signal use more power than 2G?

2G (original GSM) was deliberately designed to be very power-efficient only for low-data rate voice services.   3G was designed to be more spectrally efficient and to deliver higher-rate data services, but at the expense of using more power. Specifically: - 2G uses 200kHz channel vs 5MHz for WCDMA (25x more). Power is roughly proportional to bandwidth - GSM used a very power-efficient constant envelope modulation scheme (GMSK). 3G uses...

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