Some of us remember one of the first smartphones, the VisorPhone introduced in late 2000. Consisted of a Visor (basically a Palm Pilot knockoff by Handspring) that had a Springboard slot that you could slide a phone attachment into. I have fond memories of using it to bid on an AOL auction while driving down the highway with my ex-wife yelling at me that we were going to be killed...

Truly a product ahead of its time.