If you are traveling to or within the US in September you can enjoy free Wi-Fi at 4,000 hotspots following an announcement by Boingo that Google is sponsoring free internet access in the country. Internet provider Boingo announced this Tuesday that Google is sponsoring free Wi-Fi at 4,000 hotspots in the US including 15 airports as well as a number of hotels, shopping centers and Manhattan's subway stations. The free service is running through September.

Google and Boingo have said that only Android phone or tablets as well as Windows and Macintosh laptop users will be able to access the service, leaving iPhone and iPad users out in the cold.

The agreement come as an extension of the initial offering by the two companies which started with free Wi-Fi at some subway stations in Manhattan at the beginning of the summer and a number of shopping malls in the country in August.

Boingo Internet access costs around 10 dollars a month for unlimited use; the hourly rate depends on the user's location.

Early this summer, Virgin Media launched free Wi-Fi in some of London underground stations as part of its plan to provide Wi-Fi service at the city's transport network.