The efficiency of Voice over LTE calls has been tried out by Google via its wireless service called "Project Fi". The company has confirmed this in an announcement made in Google's product forums.

According to Tech Crunch, Google has said that the users who have been added to this group of testers should consider themselves lucky because their signal indicator will continue to display "LTE" when they are making or receiving a call, instead of falling to H that stands for HSPA. Google has also confirmed that the tests have started for a few weeks, as some of the Project Fi customers have understood.

"Project Fi" belongs to an MVNO (mobile virtual network operator) background, which sees Google working with network partners T-Mobile, Sprint and US Cellular. This makes Google network different from other MVNO's, as it can switch to the best network available at a given time. The service, though, is available to select Google android phones, including the Pixel, Nexus 6P and Nexus 5X.

According to Digital Trends, the only downside to Google's implementing the "Project Fi" feature is that it is being tested for the users from the T-Mobile network. Sprint and US Cellular users are not having this privilege as of now. Voice over LTE is a feature which has seen a number of updates on the Google network over the last several months. In October group plans and in November real time app data usage monitoring was introduced by Google.

Unlike most carriers, "Project Fi" has a unique policy of refunding its customers for the unused data at the end of every month. In addition to this, features like automatic switching to Wi-Fi hotspots and international high-speed data in many countries for no extra charges has made "Project Fi" automatically popular.

There is no doubt that "Project Fi" is taking the market by storm. In January, Google announced the extension of its "Refer a Friend" program for an indefinite period, which means the "Project Fi" customers, will be able to earn $20 credit by referring someone to the service, making it even more attractive for the users.