Google's Low-Fee Fi: Ho-HumGoogle carrier partners Sprint and T-Mobile with more than 1 million free, open WiFi hotspots Google has verified as fast and reliable. Users' devices will move automatically to the fastest connection -- 4G LTE being the standard in the United States, accessing 3G or 2G if only those speeds are available. The program will work in more than 120 countries.
Source:
Google's Low-Fee Fi: Ho-Hum