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WiFiScan is a utility for the Android platform that allows you to revist those old wardriving days we all miss so much. With your handy Android phone, you can now locate all of the WiFi signals in your area and store that information for future use.
The way the app works is simple. First, turn on both WiFi and GPS location for the best results. This lets the app not only figure out where you are but also what WiFi spots are around you. After that, just let it run. Once it has figured out how many spots are around you, you'll have a list out of the information you need.
The only real option you have for this information is to save the information and upload the locations to Google Maps. That means that you'll know what networks are unsecure in a given area for future use. This app is pretty handy but it's definitely not for everyone. It's more like a toy that we all wish we had a few years back and are now lucky enough to enjoy.