Visiting the T-Mobile Store? It is always advisable to book an in-store appointment. It's up to T-Mobile to serve you in the best possible way. It keeps you safe as well as saves time in store by making appointments for any task. T Mobile Appointment makes it easy to manage your account and services from anywhere. Pay your bill, check your usage or upgrade your plan or phone. Save time with T-Mobile scheduling from your app or by logging into your account.