What phone is equal to the iphone?

It depends if you download loads of cool stuff on to your iphone then yes it is better, but if you don't it's only as good as any other.

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Samsung Galaxy S2 "It depends on the variant(e.g S2 Skyrocket). the latest one is the most powerful"

Check the link below to know more about S2....... Yes I would say the Samsung galaxy s2 I have one and it has more utilities in it and also it really easy to download apps by the Android market. It has an extremely good camera and zoom. The screen is large and the phone is very light and slim