I like the size of my Garmin Nuvi GPS, 4.3" I just wish it had a cell phone instead of having to carry one around separately. So 1- 4.3" screened unit = better portability for me than 1- 4.3" unit and 1 flip phone. Really wish they could view java and flash pages on the web tho.
I just put one end of my Garmin Nuvi GPS up to my ear and the other end doesn't reach my mouth, 4.3" is still too small.