If you are in a noisy environment, consider increasing the volume of your smartphone slightly to avoid the surrounding noises from masking the acoustic commands. (NOTE: Never place your smartphone next to your ear while using the TONELINK app). Another common problem is that your hearing aids are not "paired" with the TONELINK App. On the home screen of the app, press the menu icon in the top-left corner, then “New pairing", and follow the simple steps.