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2009 was four years ago, an eternity in the development of mobile applications and OSes. I don’t know how much what happened then reflects the current situation. I know that BB has agreed to grant governmental agencies access to BBM in the past (India?), as a requirement of doing business there. I seriously doubt anyone is going to reveal exactly how easy it is to intercept the current model of any device, so it's hard to say how much difference there is between them. Plus, as far as government monitoring is concerned, they can just look at the records from your carrier, so I don’t know how much functional difference it would make anyway.