Sprint has announced a new Wi-Fi calling and messaging service that is expected to improve network coverage for its subscribers.

The service will allow users to make calls, send and receive text messages through a Wi-Fi network even when customers aren't in range of Sprint's cellular network, according to Sprint.

All domestic text messages and calls are free when using the service.

Sprint also confirmed the service will only be available for two Google Android phones for the time being, including the Samsung Galaxy S4 Mini and the Samsung Galaxy Mega.

Both devices will receive software updates to allow the service within the next couple of weeks.

"Once the download is complete, you will be prompted to install the update. Installation will take a few minutes during which the device will be disabled. Once installation is completed, the device will be ready for use and Wi-Fi Calling can be activated by going to your Apps folder and selecting the Wi-Fi Calling icon," Sprint said this week.

The service will be available for more devices throughout the next year or so, according to Sprint.

Wi-Fi has been a key feature used by many wireless carriers and their customers to unload data traffic, including T-Mobile and AT&T.

AT&T made headlines when it built large Wi-Fi hot zones in heavily trafficked locations to help out its users. T-Mobile did the same when it became the first major wireless company to offer Wi-Fi voice service to "expand coverage of its voice network," according to CNET.

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