As unusual as it may seem, the upcoming Samsung Galaxy Note 10.1 tabletmight actually work as a cell phone too. As in a cell phone that you can pop a SIM card in and use to make calls. Evidence in support of this rumor comes from a Galaxy Note 10.1 hands-on video, which was posted on YouTube several days ago.
Details are scarce, and the presenter does not make any calls for the duration of the video. At the beginning of the video and then later around the 1:05 mark, however, they bring up an application called "Teléfono" (Spanish for "phone"), which seems to be a working dialer (as far as we can tell). The tablet is branded for the Mexican carrier Telcel, which is why the interface language is set to Spanish.
Samsung Galaxy Note 10.1 might be a rare exception, although using a wireless headset of some kind might be highly advisable. Nevertheless, we won't get our hopes too high yet since the device in the video might be a prototype running non-final software. Besides, the Galaxy Note 10.1 for the U.S. market will probably have the feature locked down anyway, even if it is present on versions for other markets.