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BlackBerry Bold 9790
My iPhone escapades on a February trip to New York and San Francisco was far from a fruitful endeavor; I ended up spending more than four-times on the cost of data (along with the cost of the iPhone itself) which left me almost $2,000 down in the space of a fortnight.
Email is my primary motivation for keeping my BlackBerry, with data compression and a physical keyboard second and third. It churns through only a fraction of my monthly data tariff, and the mini-keyboard means my MacBook, which would normally be used to write emails, can stay in my bag conserving power. Above all else, phones are for talking with: I've never known call quality to be so good. Many callers thought I was permanently in a tunnel or a bathroom with the amount of echo my iPhone kicked off when I had it.
Plus (see later) for encrypted emails, a BlackBerry is a must. You never know which government's are looking in, and when dealing with occasional matters of political importance, it's better to be safe (and paranoid) than not.