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Support 2G / 3G Switch

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http://androidforums.com – Hi All, To improve the battery life of my device, I would like to use 2G networks instead of 3G. But I couldn't find a 2G/3G switch. Can anyone tell me where this setting is? I'm using stock rom. Thanks... (I'm pretty sure that there's such a setting in android 4, I used that feature on my previous device but I couldn't find it in anywhere for my stock i9300) (General)