A lot of businesses offer free WiFi these days. Throw in restaurants, hotels, hospitals, and even some cities, and you have a lot of options for surfing if you don't want to use your data. When you're traveling, or need to get out of your house for a while, but still need to work or check in on Facebook and Twitter, you do have options if you know where to look. Here's our list of the best WiFi apps for the iPhone.