In reply to JayPee630:
How big is your phone, is it water resistant and how are you going to carry it? The latest smart phones are too big to fit in a pocket or require a large unwieldy arm pouch. I've just bought my wife a smart watch because her new phone is too big and not water resistant.
I use Endomondo or Strava on my Iphone 4s to track distance mostly mountain biking ( carried in a rucksack) and a handful of runs ( phone carried in a zip pocket in my shorts ). Major issue I've encountered is that the phone struggle to get a GPS lock if you are out of mobile reception. Both apps can be setup to record heart rate from a chest HRM bans.
My favourite feature on Endomondo isthe audiocoach that Ican configure to shout out mypace at regular intervals rather than having to glance at a screen. My wifes favourite feature is the live-tracking so she can worry about whether I've fallen off the side of a mountain.