ForcePhone functioning like ComTouch is the implementation of the concept. The mobilephone senses the pressing force and transfers this signal to another ForcePhone. The signal will then be translated to vibration output. Hoggan's study demonstrated the possibility of how to translate different pressure to different vibration pattern.
Reference: Hoggan, E., Stewart, C., Haverinen, L., Jacucci, G., Lantz, V. 2012. Pressages: Augmenting Phone Calls with Non-Verbal Messages. In UIST'12
http://www.technologyreview.com/view/429618/squeeze-your-phone-and-send-a-loved-one-a-hug/
http://www.engadget.com/2012/10/16/forcephone-from-nokia-hiit-sends-positive-vibes-with-a-squeeze/