I had no idea such a thing had existed!! I would have considered grabbing one back in the day back in the day.
My first phone with a keyboard was the Helio Ocean.
Helio was a south korean (I think) phone business and carrier that was trying to breakout over here in america; with prepaid plans. Their phones were pretty capible for that point in time. I have distinct memories of being able to hit the google reader mobile interface with this guy, on it’s very primitive browser. Also Helio phones were capible of MP3 playback though getting the files onto them was something of a chore. So much so im not sure I ever did it!
The neat trick of this phone was that in landscape it slid to reveal a keyboard and in portrait it slid to reveal the T9 dialing interface.
I didn’t start off with the Ocean I had a less keyboard intensive phone at the time with them and was able to snatch the Ocean off someone else who was ditching them for a traditional carrier. I left Helio long ago for T-Mobile’s contractless stuff but I held onto it for a long time until tossing it out just three or four years back or so. Was a very fun phone.