Cell phones with Presence technology now where you are and what you’re doing and can also anticipate what you will need. These cell phones can route your in coming calls of you are in a meeting and can turn on your home heating system 10 minutes before you reach home.
Industry designers hope that this technology should be pleasing to the user and should not bother him.
Designers also pointed out that since there is no simple way to design a device that will cater to owners without stalking or bugging him thus they will allow the users to opt in to services.
via: textually