While Fi has been hammering down mobile costs for domestic use in the US, it had been hampered by limited browsing while abroad. Previously, Google had limited roaming speeds to 256Kbps to ensure a reliable service for users travelling abroad before the deals were in place.

In addition to providing faster data in 135 countries for the same $10 per GB fee as in the US, Google recently boosted the wireless reception of the service for customers and removed the requirement for an invitation. You will still need a Fi-compatible phone though.

On Three's side of things, it's a move that makes a lot of sense -- it already offers its UK customers roaming that's included with your regular package in a host of countries, so adding another US carrier to the list can only improve its appeal to potential customers.