The problem is the phone connection. I use the belt with the Galaxy S4. The mobile phone is specifically identified as being compatible. It has the latest firmware and software and no special features in the operating system. It works smoothly with me in all possible applications.
In the chest, there were considerable problems. The first hurdle was to find out that the battery needs to be reseated. This does not follow from the instructions. If you open the battery cover, you can see that the battery is placed under a special metal clip.
Then closed the activation of the chest strap is not immediately. I then followed a council here and have the runtastic app uninstalls, phone restart, reinstall.
Finally the Bluetooth scanner indicated that he recognized the belt. If one believed now everything should work, then you are mistaken. Because it is still not able to receive the pulse beats. Why, remains a mystery even after a lot of trial and error. I have also a then- advice from these reviews following on and off the Bluetooth mobile phone. In the fourth or fifth time and a long wait and try it worked.
Long story short: You feel transported back to the Stone Age of radio connectivity. Actually, you can such a product no longer bring such software setup on the market, and certainly not advertise that the belt bearing the above and those mobile works. And the Galaxy S4 is finally not exotic, but a mass product.
Not advise