iPhone 4. I'd wanted an iPhone since they first hit the market, but went through some issues with one provider when I was younger, so was stuck dealing with another that didn't offer the iPhone. I eventually got myself an iPhone 3GS once Bell provided them, and ended up with a 4 last Christmas as part of a deal to get my mother a new phone (re: my "old" one).
While plenty of people have negative reactions to the iPhone, and there's a couple limitations I'm not thrilled over, I don't bother jailbreaking it, and given my professional life, it's been an excellent phone. It does everything I want it to, and can do a fair bit more, so it was a damned good investment, in my book. Prior to that, some soddy Samsung flip. I wasn't all that much of a cell phone person until my career demanded the accessibility, and now I'd find myself hard-pressed to go without.