Re: Those were the days....
I did that as well. Had a bright yellow slidey case for my 2210 - I think it was (their names were so rubbish). Anyway the one that was ubiquitous just before the 3310, and a bit bigger.
You pressed a button and the keyboard cover pinged down. Snapped on to replace the front and back covers, and cost about £5 from the local market.
I've always liked a mobile that you could cover the keyboard, so it couldn't be pressed in your pocket. Had a Motorola MicroTac, that Nokia, a Samsung slider and best of all 2 Motorola RAZRs.
The RAZR, best ergonomic phone design ever. Some of the worst software though...