T-Mobile app is garbage, for years now. I've been a customer for about 15yrs now. Service is horrible, service transparency is non existent and they're just flat out robbing everyone, as if they're doing you a favor to be customer. But then again that's every provider nowadays. As a company they just squeeze you for everything every chance they get, specially when it come time to upgrade your device.*Up to 800 credit for your device* you can have it in a box never used &only200will b credited