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You'll need to log in to your mytmobile account online. If you've never logged in before, you'll need to register an account. Your usage details will be available to print out, or just to browse.
If you have a postpaid account, you can review logs of calls, data and text messages (but not the content of text messages) by logging into My TMO and clicking on the “Usage” tab. Unfortunately, access to usage logs is not available on prepaid accounts.