login via my.t-mobile.com using your cell number.
once logged in, then under my account
click bill and usage.
from the screen that appears on the right handside click "see minutes used detail"
*note T-Mobile flexpay users will not see the link above
*the details above will show all calls made/ recieved since the beginning of your current billing cycle
* the details for your last billing cycle show under billed usage within about 5 days of that cycle closing but are not available durring the 5 days that they process from unbilled to billed
