There are a few ways to access T-Mobile voicemail from either your cell phone or a landline. These options give you the ability to choose the most convenient method for you as well as to access your voicemail when your cell phone is missing or out of service. To protect your privacy, create a memorable -- but not easily guessed -- password for your voicemail, which you will enter this when accessing your voicemail messages.
Hold down the "1" key on your T-Mobile phone's keypad, or dial "123" and hit the call button. Enter your voicemail password when prompted.
Dial 1-805-MESSAGE (1-805-637-7243) from your mobile phone. Press the star key when the voicemail greeting begins, then enter the password when prompted.
Dial your mobile phone number from a landline telephone. Allow the phone to ring to voicemail, and then interrupt the greeting by pressing the "*" key. Enter your password when prompted.