For Staying Connected: Wi-Fi Finder
(Free; iOS, Android)
All of these apps are useful, as long as you have an online connection. You can always catch a 3G or 4G signal. In fact, why even use your cellular data if you can jump on a Wi-Fi public hotspot?
Wi-Fi Finder is an app that scans the area you are in for public Wi-Fi hotspots. Currently, the app tracks over 550,000 free and paid hotspots in over 144 countries.