Just so that no one else makes the same mistake I did, you also need an iPhone4S or newer for this to work.
It would be nice if on the site there was a mention about phone compatibility along with computer compatibility, since if you just check the site and then download the iPhone app from the search results page in the App Store without clicking through to the app description, you don't see the compatibility warning.
It's my own dumb fault, but it wouldn't hurt if it was a little more obvious.
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