Google Fi user here.<p>I don&#x27;t think there is any &quot;partnership&quot;, the &quot;Wifi Assistant&quot; feature just joins open wifi networks. It does do two neat things: first, it establishes a VPN tunnel through a Google controlled endpoint. Second, they seem to have a database tracking the quality of wifi networks. It won&#x27;t join networks that are known to be slow, and if a network gets too slow it will automatically disconnect.<p>In practice though, almost every open wifi network is slow. Much slower than LTE, and certainly not something you could reasonably make a voice call over.<p>Overall I&#x27;m relatively happy with Fi. The service is a little better than T-Mobile (still not as good as AT&amp;T) and the management interface is dead simple. Its what a software startup would build if they went into the cellular carrier business. And for my level of usage (3-4GB&#x2F;month) the price is similar to T-Mobile.<p>But don&#x27;t expect it to save you bandwidth.