Premium version allows you to configure your phone so that USB tethering is automatically turned on whenever the phone is connected to your laptop via the cable. You don't even have to tap a Yes button on the phone screen.
Use the free version to verify if USB tethering works with your phone/laptop. Then upgrade to Premium so that you can just plug in the cable to get on the Internet via 3G/4G mobile network from your laptop instantly and charge your phone at the same time.
All features are in the free app but the premium features are locked. To unlock them please purchase the Auto USB Tethering Premium app on the Market. It is an unlocker not a real app. Once the unlocker is installed, Premium features will be accessible in the regular app.
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Please check out my new app, Dropsync. It is a full two-way automatic Dropbox sync client. Great reviews and ratings so far. And if you buy Dropsync PRO you get Auto USB Tethering Premium for free. This app checks if Dropsync PRO is installed on the phone and if so, Premium features will be automatically unlocked.