Read my lips - How useful are (cell) phones that can interpret silent mouth movements?

The future (mobile) phones might be able to convert silent mouth movements into speech. The unique method has been developed by the researchers at Germany’s Karlsruhe Institute of Technology (KIT).

The new technology will allow communicating in silent environments, at the cinema or theater, without disturbing others. Under this technique, the user can speak into the phone soundlessly, but is still understood by the conversation partner on the other end of the line. The technology is based on the principle of electromyography which is the acquisition and recording of electrical potentials generated by muscle activity. This muscle activity is measured in the face and converted into speech. The transmission of confidential information like passwords and PINs will become easier as a result of read lips method.

http://wirelessfederation.com/news/22751-mobile-phones-reading-lips/

The technology might also be useful in crowded noisy offices. Or for people with a sore throat or a general vocal cord condition.

What do you think about this? Would you be willing to use this technology if available?