I just received my Samsung Gear Fit and found that my Galaxy S 4 is not yet compatible since it is Android 4.2.2. The Samsung support rep said that is only compatible with the S 5 right now and to wait a week. This is a known glitch, according to the rep. So I will be waiting, not so patiently and will keep trying. The way I found out was trying to find the Gear Fit Manager app in Samsung apps. I went to the apps website on my phone and got the message, "This phone is not compatible."