Power saving mode of mobile with 3 network?

    I have pay as you go from 3 and wondering what can increase battery life. I am only intrested in voice calls. I can select UMTS(3G) or GSM mode. UMTS certainly consume more battery but with 3, GSM is kind of roaming on Orange network and in roaming network keeps looking for another network and might consume more battery.

    any view is welcome,,,,,

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