A Nexus 6 firmware update potentially sheds some light on Google's upcoming wireless service.

As reported by Android Police, the update includes new apps that provide a glimpse into what Google might look like as a mobile virtual network operator (MVNO).

An app with the codename Tycho will reportedly be the central command for Google Wireless, where you'll have control over your service's settings and options. That's not overly exciting, but when you dig into the fine print, it appears that customers will be charged on a per gigabyte basis rather than paying a set price for a monthly data limit, like many current carrier plans offer.

It seems unlikely that you'd be penalized for going over your purchased data limit as you'll be able to purchase more from the Tycho app, and any data you haven't used will be rolled over into the next month or period. It also looks like all calls to U.S. and Canadian numbers will be free. And despite rumors to the contrary, international calls may incur small fees, similar to what Google Voice currently charges.

Google Wireless will reportedly provide cellular service by tapping into Sprint and T-Mobile's networks.

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