Google said it would launch the "Nexus" of phone networks in the near future, and we may now have a good idea of what that means. Android Police has unearthed Nexus 6 firmware with an app for Project Fi, which appears to be the in-progress name for Google's wireless service. The code suggests a very different approach to mobile data than you're probably used to, even compared to a pay-for-what-you-use offering like Ting. You'd pay only for the gigabytes you expect to use, and you'd get credit back if you don't use as much as planned. There are no mentions of overage fees (you'd just pay the usual per-gigabyte rate), and Google would be unusual among virtual network operators in its willingness to support multiple lines and data-only devices like tablets.