Okay so I currently have a phone on T-Mobile. A few weeks ago we went to the T-Mobile store and adding a line to my sisters existing plan which made it become a family plan. It cost to add the line and me and my sister are sharing the same minutes. So basically we have 400 minutes and we are sharing that 400 minutes between both of us. How much would it cost to cancel my phone? I remember in the store that the guy said something about how it would be cheap or free to cancel my phone because its sharing the minutes with my sister.