First to last:
Motorola Q - Windows Mobile 5 (I think) in 2007. Great for a first smartphone but I ditched it when it started freezing a year later.
iPhone 3G - iOS 3-4 - 2009 - One of the best I've ever had. I was happy with this phone the whole time I had it - it was fast, reliable, and well built. If Apple hadn't killed it with the awful 4.0+ updates, even downgrading wouldn't fix whatever they did to it, I would probably still be using it now.
Samsung Focus - Windows Phone 7 - 2010 - Great phone, iPhone 3G had better camera though. Accidentally dropped it into a pond while at a park lol
Blackberry Torch 9800 - Blackberry 6 OS - 2011 - Replaced Samsung Focus, love/hate relationship with this phone because of the terrible lag/crashes but it's my go-to backup because the hardware is so sturdy. The camera was honestly one of the best I've ever used on a phone though thanks to the incredible autofocus/stabilization (I have a problem with shaky hands), I loved being able to download in the browser, and the hardware keyboard was incredible.
iPhone 4S - iOS 5-6 - 2011 - Replaced my Torch with an iPhone 4S. It was a nice upgrade but the Camera was just okay and I missed being able to download apps/file/anything from the web browser rather than a store.
HTC One X - Android 4.0 - 2013 - Traded my iPhone 4S in for this, loved having a huge screen and a phone that had all the options from Blackberry plus a great camera and great battery life with zero lag. Absolutely best phone I've ever had but lost it while on a road trip.


HTC One X+ - Android 4.1 - 2013 - AT&T replaced my HTC One X with this and it's okay. The phone is ridiculously hot to touch, lags when it gets too warm, heats up and lags when downloading large files on network, and it can't last a full day of use for me - all thanks to the Tegra 3. Kind of a downgrade despite the name but at least it has 64GB of storage rather than the 16GB the One X had.