6.
Blackberry Quark 6210 (2003):
Actually, I wouldn’t say Quark overthrew Treo but at least to some extent, the Quark 6210 was a great innovation from the Research in Motion company. The device which though had its navigator like an old rolling volume key situated by the side of the device while its screen graphics was black and white. Well, tech was just growing as at then and Quark tried to blend much in the game.