Anyone who is smart before, is better off. Unfortunately, I have only made smart after I already had the belt and he could not be with my Galaxy S4 mini combine. In Endomondo is listed, that this belt is not supported by the app. Basically, it works well with my phone. However, only with BLE Heart Rate App. But the product description I find it a bit misleading because it gives the impression that the belt would always work with the listed devices.