Hacked Nokias add haptic dimension to calls

from www.wired.co.uk:

>>A pair of hacked Nokia N900 phones are capable of providing an extra sensory dimension to phonecalls by allowing users to send one another touch messages.
The ForcePhone prototypes were built by the Helsinki Institute of Information Technology in collaboration with Nokia Research to investigate haptic communication options. It could also provide users with the option of squeezing the handset during a call to trigger a vibration in the paired receiver, referred to as a "pressure message".