Google Project Fi customers can set up their phones as a mobile Wi-Fi router and allow their laptops or tablets to surf the Internet on their phone's data connection at no extra charge. This process is called wireless .

Tethering

Explanation:

 The wireless tethering is one of the process in which the one person sharing their phone's data, information or file to the another mobile devices over the internet by using the various types of wireless devices such as Bluetooth, Wifi and the universal serial bus cable (USB).

According to the given question, the google project consumers setting up their phones with the WIFI routers and they allow their devices such as tablets, laptops for the purpose of surfing data by using the internet connection.

Therefore, this process is known as the wireless tethering.