Today Google has announced that its wireless carrier, Fi, is finally adding a group plan. Google Fi launched last year and has been growing ever since. It works using the networks of Sprint, T-Mobile, and US Cellular and it automagically switches between them to give you the best possible coverage and data speeds. There's only ever been one plan on Google Fi, keeping things simple for everybody. However, many people are used to other carriers' family (or group) plans, which allow them to save quite a bit of cash when bundling lines together in this way. So Google had to introduce something...
Source: http://www.gsmarena.com/google_fi_gets_a_group_plan-news-21006.php