Unlock built-in DIGITS on T-Mobile branded Samsung and LG phones
DIGITS is built-in to most newer T-Mobile branded Samsung and LG devices. To see if your device supports built-in DIGITS, open the Device page and look for the DIGITS app document. If it's supported, you'll need to unlock the settings with the steps below.
Make sure that your device is running the latest software and is connected to the T-Mobile network over cellular or Wi-Fi. To check whether your device has the latest software, look at the Software Update document for your device on the Devices page.