5.
Palmone Treo 600 (2003)
Treo was the beautiful qwerty button device that looked very great in hand and being a conventional device that could bridge business and connectivities actually did gave it its own chance to shine in the market. The Treo as at then would be the must use device which was just extraordinary in its own niche. The Treo soon got flipped out by another device and that is just the game. Its competitive.