Google’s Project Fi Mobile Virtual Network Operator (MVNO) service has been an intriguing value proposition for smartphone users since its introduction over a year ago. Project Fi allows you to use Wi-Fi (whenever possible) for data and calls and can switch to cellular carriers (selected based on signal strength) when out of Wi-Fi range.

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Source: Hot Hardware – Google Project Fi Gains International LTE Muscle With Addition Of ‘Three’ European Carrier