Well, let's throw out what's going to be worthless (or next to).
Car/Apartment Keys
Cash
Credit Cards
Driver's License
Swiss Army Knife
And you're left with your phone and your USB stick. If you assume those films are encoded in a format that's readable 15 years ago (not likely), you'd need to know the right people in order to make any kind of money out of them. You probably won't be able to walk into a major studio and pitch them right off the bat (they'll assume that someone else made them and that you're pirating unreleased material).
The phone may have value. But you'll need to demonstrate a legitimate reason for owning what appears to be a prototype device. Walking into Samsung and saying you have a phone from the future will just raise eyebrows and possibly get you ejected rather quickly.
The USB stick itself may be of interest in terms of the larger capacity (assuming the OS can address that much storage). Since there's no USB 3.0 ports back then, it'll look and act exactly the same as existing flash disks.
Unfortunately, in order to convince technologists, you have to convince them that you're a technologist who has invented a particular component.
For real money, you need to take some antique gold, get it melted down and use the money to buy shares in key IPO offerings.