If your TrackR device can't ring your phone, please verify the following:
1) Please make sure you press and hold the device button down. The phone will ring as long as you are holding the button down. Also note that you must be within Bluetooth range of your phone. Bluetooth range is up to 100 feet but tends to work best within 30-40 feet.
2) For iOS devices, please make sure that Bluetooth Sharing is set to ON. You can change this setting in iPhone Settings->Privacy->Bluetooth Sharing.
Questions? Contact Support!