If I was going for an Android phone I would go for a good spec (quad core A9 or dual core A15 and 1GB+ RAM) as in my personal experience (HTC Desire, Galaxy S2) anything below can lag and stutter through menus.
The Samsung Galaxy S3 and Nexus 4 both comfortably fit in this category. If going with iOS then stick with at least an iPhone 4S.
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The Samsung Galaxy S3 and Nexus 4 both comfortably fit in this category. If going with iOS then stick with at least an iPhone 4S.