For most of the time I was using slider smartphones:
The first was a Vodafone branded HTC Wizard 110, the second a Sony Ericsson Xperia X1, also designed and made by HTC, both running "Windows Mobile", an abomination of a mobile OS which could only be used with a small stylus that accompanied both handsets. Except for the keys which weren't too durable, I really liked the early Xperia's hardware, though, and sometimes I wish we could still get smartphones with such compact dimensions.
The first HTC Desire Z, after the keyboard more and more gave out, was replaced with a second