Google has been working on their own MVNO, as has been reported earlier this year. While not a whole lot has been announced officially, lots of rumors have been spreading as to what this might look like, such as Google being able to offer service plans for cheap by purchasing them in bulk (sort of like a Costco for mobile network plans). Another rumor is that this service won’t be tied to just one carrier or cellular data type, but rather your phone will just use whichever carrier is offering the better service at the moment you’re using it. So if you live in San Francisco, you might regularly be using T-Mobile’s network, but when you travel to Los Angeles, Sprint might have better service, so your phone will automatically connect to that (no actual evidence supporting that, just an example). It looks like Google might offer this globally as well.
According to Telegraph, Google is in talks with mobile service provider giant Hutchison Whampoa to offer users free service when traveling internationally, much like T-Mobile currently does. Hutchison Whampoa is already trying to do this across Europe with its Three UK mobile network. So this partnership would be quite natural. However, if this deal between Google and Hutchison Whampoa is successful, than Google might be able to offer service globally for the same, low-cost. If Google can achieve that, than it will do a lot to place pressure on the mobile carriers, where pressure is much-needed these days.