The Motorola v3688 clamshell phone was released in 1998. At the time it as marketed by Motorola as one of the smallest dual-band mobiles in the world.
The monochrome screen had a resolution of 96 x 64 pixels organised as a five-line display with fixed icons. In addition to the standard set of phone functions and SMS messaging, it provided a clock function, a phone book that could store 100 telephone numbers with associated names and a call log which recorded the last 10 dialled, missed and received calls.
Some information courtesy of Nigel Linge & Andy Sutton, the authors of 30 Years of Mobile Phones in the UK (Paid Link)