The NHS trust said phones were on every ward, so people could still speak to their relatives and friends orleave a message for them, while visiting was restricted.
You could leave your friends personal notes or restaurant reviews by dropping message chips that come alive when your friends' sensors come into range.
If you still manage to leave your favourite jacket behind, it will send you a text, email or Facebook message with the GPS coordinates of the last known location so you can track it down on Google Maps.