I like the look of the Galaxy Grand but in my limited experience with dual SIM devices I know they can be a major drain on your battery because your phone can be searching for two networks at once. You can usually set your device to have one on and one off (if they are for separate countries, for example, and you don't need two SIMs functioning at once), but if you have two running simultaneously you'll need a good battery.
Alternatively you can usually set one as default and the other as an option (when placing a call or texting for example) that only activates when it is needed. But that doesn't help if you need to be able to receive calls on both SIMs at once - but again, I'm not 100% sure on this because I've never owned one. I was talking to Jakob about this the other day and he said most of the people he knows that need a dual SIM phone end up just going for two phones rather than get a dual-SIM phone they don't really like that sucks too much battery.
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