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I got myself a MDA Vario III (also known as HTC TyTN II) back in August for £115 off amazon second hand after my old MDA Vario I stopped working. The Vario III is a great device and my best smartphone to date.
The phone as everything you could ever need, Wi-Fi (802.11b/g), 3.1 megapixel rear-facing camera and 0.3 megapixel front-facing camera for video calling and built in GPS and a slide out QWERTY keyboard that's great for texting, the keyboard also tilts so you can use it on a desk like a kind of laptop but I've not found it useful.
After using this phone for about a month now I've found it very reliable, the battery life last about 3 days sometimes 2 if I've been using the camera a lot and I've since brought an extra battery just in case only £7 off eBay not bad if you ask me and well worth it. The phone is powered by Windows Mobile it came with Windows Mobile 6.1 and I've since upgraded to 6.5 with a custom rom witch is great, if you don't like the OS that your using you can look for others that people have made and i find them far better than the one Vodafone shipped with it but saying that there was nothing wrong with it i just wanted a change. So far I've not found any problems with the phone everything as work fine with no trouble though it would of been nice if it had a headphone jack port instead i had to buy a mini usb to 3.5 headphone jack cable was only £2 but still an extra thing to buy . I found myself quite surprised how little i use the stylist I found that using just my finger and the four navigation buttons good enough.
If you're looking for a cheap well rounded smartphone The MDA Vario III is well worth a look into.
The great thing about the Vario III is that the changes are subtle, but at the same time significant. Basically, nothing has been done to spoil the recipe of the previous model, but a great deal has been done to improve it. First up, it's ever so slightly slimmer than the TyTN, or the Vario II - not enough to make a massive difference in your pocket, but it is noticeable when the two devices are placed next to each other. Actual measurements are 110 x 58 x 18mm (LxWxD). That said, the Vario III is heavier than the older version, weighing in at 191g compared to 178g.