The Visor was a neat device on account of the Springboard slot. There was an attachment, the VisorPhone, which turned the Visor into what you'd easily recognize

The Visor was a neat device on account of the Springboard slot. There was an attachment, the VisorPhone, which turned the Visor into what you'd easily recognize today as a smartphone. To boot, PalmOS on the Visor had a working TCP stack, so you could dial out (literally dial out - there wasn't even GPRS on it!) and send/receive e-mail, browse the Web, and so on.