A very interesting application of the smartphone could be to allow it to open doors using a provided the user scans it’s finger on the fingerprint scanner.
This is a great idea because it means that you could give family or friends access to your house by selecting them from your phone, it would allow you to moniter which doors are open/closed and who has been in the house and when. It would also be a great way to know if anyone is home or not.
Considering someone may possibly be able to access a house if they steal someone else’s phone, security is definitely an issue but the fingerprint reader on the iPhone would ensure no one but the user could access the house.
There have been a few attempts at this, but none being so secure with such possibilites, you can see one example here;
This is something that is very likely to happen as Apple have alreadly begun to explore within key access using the iPhone and hotels, especially since Apple introduced a way to pay using your phone which uses NFC (Near Field Connection), this isn’t a huge step compared to what they have alreadly acheived.