My Fourth Smartphone
i-mate SP3i. The first Windows Mobile device that I found totally useful. The longest serving Smartphone for me; maybe not, the Cingular 2125 might get that award. This phone had an awesome keypad inspite of the surface area limitation. Good screen, great battery life and decent signal strength. Overall this was one of the first decent Smartphone and my first experience with an HTC device.
More details over here.