Project Fi's Wi-Fi Assistant now works with Nexus models running on any carrier's network
The advantage of using Wi-Fi Assistant is that the user doesn't have to do anything except enable it one time. It will seamlessly switch calls between Wi-Fi hotspots and the user's cellular network. Google will even make sure that when on Wi-Fi, data is encrypted. This will allow for the same secure connection available when the user is connected to his cellular provider. And the service can be disabled at any time.
Wi-Fi Assistant will be offered to Nexus phones running Android 5.1 or higher. That includes the Nexus 4, Nexus 5, Nexus 6, Nexus 5X, Nexus 6P handsets and the Nexus 7, Nexus 9 and Nexus 10 tablets. The update has already started going out to U.S. Nexus owners; other markets that will get the feature, like Canada, Mexico, U.K., Denmark, Finland, Iceland, Norway and Sweden, will have the update sent out in a few weeks.