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Tech giant Google finally unveiled its talked-about wireless network service. The service known only as Project Fi will offer pay-as-you-go data subscription.

Project Fi will use Sprint and T-Mobile cellular network, according to Ars Technica. Google's new service will also automatically change the user's network to the fastest 4G LTE, 3G or 2G signal available within the area. Google added that the service will automatically switch to a Wi-Fi connection whenever available, probably to prevent users from capping their monthly data allowance.

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The user does not need to manually connect their phone to available network or Wi-Fi signal. Project Fi will automatically do this whenever it detects that that user's signal is weakening. The company added that when a user's signal weakens, the service will seamlessly transition to the fastest cellular network available.

To add another layer of privacy for its users, all voice and data information accessed through a Wi-Fi connection will be routed into Google's own Virtual Private Network (VPN).

Google is also offering a different pricing scheme to its new cellular service. The lowest tiered service is for $20 and consists of unlimited talk minutes, text and Wi-Fi tethering. On top of that, if customers want to use add a data plan it will only cost $10 per gigabyte.

The most interesting part of Google's pricing scheme is that it will only charge for the amount of data that the customer consume within one billing month, according to Digital Trend. This means that customers will be credited for any rollover data they have not used.

Google gave a pricing example to better explain it. A customer who opted out for a $30 3gigabyte plan but only ends up using 1.4 gigabyte will be credited $16 instead of paying for the whole $30.

Google announced that the service will only be available for the Nexus 6 smartphone. The company did not say whether it will support additional phone models in the near future.