8. Share Files Between Devices Wirelessly
These apps let you wirelessly transfer files between your tablet and your computer via a Wi-Fi connection. Note: Such transfers are faster and less complicated than (for example) emailing a file to yourself.
You can also check out syncing apps, such as SugarSync (Android and iPad) and Dropbox (Android and iPad), which automatically sync your selected files with all of your devices whenever you're connected to the Internet.
9. Find a Wi-Fi Connection
Finding a Wi-Fi connection usually isn't very difficult, but many popular dedicated apps such as Wi-Fi Finder require an Internet connection in order to search for a Wi-Fi hotspot. Obviously, if you're working with a Wi-Fi-only tablet, that prerequisite won't fly.
Instead, check out apps such as Wi-Fi Analyzer (Android) and WiFi Scanner (Android) to see nearby networks and their signal strengths. (iPad users have a harder time of it because Apple pulls Wi-Fi scanning apps from the App Store; consequently, the only alternative is to jailbreak your phone.)
Want to know whether a "free" Wi-Fi network actually requires a browser log-in? Check out WiFi Browser Login (Android), which notifies you if the Wi-Fi network that you just connected to is about to shut you down when you open a browser window.
10. Use Wi-Fi to Make Phone Calls