No doubt the battery is *the* issue here. I don't think the watch would be often used for surfing or long calls - more for small "events" - let's say a race, marathon, triathalon, etc. My "dream" would be something I call "handoff" - that when your phone is in proximity to your watch - the watch "assumes" the cellular connection, but when the two are apart, it defers to the watch. (Obviously, you could override if needed). This would have massive problems with cellular service today because you would effectively need two identical SIM cards - or the equivalent. This way you only have one cell service/number.