From xda-developers forum:
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Hi every one.
My battery life to was abismal, that was until I read this over on Modaco.
GSM 2G+3G ("WCDMA preferred") drains battery over 5 times faster than exclusive 3G ("WCDMA Only")
Average battery drain / hour when phone is idle with screen off:
1-Standard shipping mode WCDMA prefered, i.e. both 2G and 3G enabled, Wifi off): 10% / hour
2-Alternate WCDMA Only mode, 3G exclusively, no Wifi: 1.7% / hour
So I tried changing the phone settings from WCDMA prefered to WCDMA only. WOW battery life instanly better!!! 3G still works and phone OK.
To do this enter *#*#4636#*#* on phone dial pad, select phone information, then scroll down to selection box, change set preferred network type to WCDMA only. Switch phone to airplane mode, then switch airplane off and watch your battery performance increase by 300% plus..
Yo lo probare hoy... ojala resulte.
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