Can the Apple Watch now be used without carrying round an iPhone? I watched the keynote but am still unsure. I'd like to use the watch when I go on walks but leave my 6S at home. Is this possible? Also does the Apple Watch support the app myfitnesspal? I'd like to use it to track footsteps like I do on my 6S. Lastly, will the new Series 2 support a 6S running on 9.3.5?