the important bits on that page are:
Will I have all the phone services like MMS, SMS, and voicemail with T-Mobile @Home service?
T-Mobile @Home features include nationwide long distance, call waiting, caller ID, 3-way conferencing, voicemail, and call forwarding. CallerTunes® and discounted calling to Canada or Mexico are available as an add-on service for home phone usage.
How is data charged with T-Mobile HotSpot @Home?
All charges for data services such as text messages, picture messages, Web browsing, downloads, and ringtones are the same while using Wi-Fi as they are on the T-Mobile GSM network. In addition, all services available through GPRS are also available through Wi-Fi, including:
* Picture messaging
* t-zones and Web browsing
* Content downloads
* BlackBerry® services