I'm thinking I'll stick with my bike computer that I have and get the fancy phone but not do GPS on it for biking. Maybe I'll get a fancy Garmin down the road, but for now we use the information on my husband's to keep track of rides. I don't do the really long ones by myself anyway. I have a wrist watch that measures heart rate but I can't get it to give me results if I'm working hard and I have to press a button with one hand while the other hand is still on the bike and that's hard for me to do. I never use it anymore.