Every time I see an ad about some product or service that can be accessed through a smart phone, I think about all the things a thief who steals a smartphone has access to.
Off the top of my head, someone with your smartphone could:
1. Locate your car.
2. Unlock your car door.
3. Access your GPS on the car.
4. Start your car.
5. Disable the security system at your house.
6. Open your garage door.
7. Unlock your doors and turn on or off the lights.
8. Turn on and off the water facets.
9. View the security cameras you have on your property, and I presume, turn them off.
10. Access your bank account and do anything that you could do at the bank.
11. Access your investment accounts.
I'm sure there's lots more, these are just things I've seen on ads.