Access Voice Mail on your iPhone via http://voice.xmission.com/iphone
To access your voice mail from your home phone, simply dial *98. Depending on your settings, you may have to enter your 4 digit pin code.
To access your voice mail while away from your home dial one of the following numbers. When prompted enter your 10 digit telephone number followed by the # sign and then enter your pin number.
To access your voice mail away from home, use one of the web interfaces above or dial your home phone number and wait for the outgoing message to begin playing. Then hit * on your keypad. You will need to dial your 4 digit pin code.