I recently heard about a trick for iPhone 3GS owners who have the latest version of the Yelp app. Yelp, as you probably know, lets you search for restaurants or other services and read user-written ratings and reviews. I've noticed that the Yelp app particularly comes in handy when I'm on vacation: it lets me find out right away what the locals think about a particular restaurant without having to find out for myself. But a hidden feature in Yelp for iPhone 3GS owners has been revealed recently that adds a whole new dimension to Yelp ratings.
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