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An iPhone is pretty much better in every department. As a guy who's used both I would NEVER choose a BlackBerry over an iPhone, I would probably even take an iPhone 3GS over any of the new Blackberry's coming out to be honest. As for ease both are fairly easy to use, nothing as complicated as lets say Android can be.
 
I bought a BB Bold simply because my friends far and near were mostly on BBM (this was before Whatsapp) it was novel at first but once Whatsapp became more popular I don't use the BB anymore, iPhone is WAY better!
 
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