how do i check my voice mail from another phone

Dial the number but that you want to check. After the message plays push the *. You will then be prompted to enter your passcode and press the # button. Your voice mail will then operate as if you were on the phone with all functions available to you. Hope that helps I just tried it myself out of curiosity and it works. If you don't have a passcode you will have to log on to your T-Mobile account and set up a passcode.