Sprint has negatively influenced T-Mobile. What used to be great company, has declined significantly since being associated with Sprint. Now, the app no longer works. I would think that a cell phone company could create an app that works with my T-Mobile cell phone. I uninstalled to the extent that I could. I updated and there isn't a place to type in my number or password. P Neither power off/on nor hard reboot helped. Customer Service doesn't answer. Very unhappy.