One star is the lowest I can give this app, phone, or T Mobile as a service. The phone is quirky, deletes phone numbers in my contacts, locks up and doesn't allow any keypad movent unless I restart the phone. This is the second phone of this style, and the same problems. Going to a T Mobile center is of no help. Maybe it's the 5G service, but it's not much help if you need a phone in a crisis situation. I'm not sure if it's the app, or the phone, but it's frustrating either way.