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Sprint said today it has enabled Wi-Fi calling on the iPhones in its portfolio.

Wi-Fi calling is, of course, less expensive that cellular calling, and it can be a great backup for when no cellular signal is available. And Wi-Fi calls sound better — when plenty of bandwidth is available. It can also be useful for calling from within buildings, where cellular signal sometimes can’t penetrate. The carriers also see Wi-Fi networks as a way to preserve bandwidth on cellular networks.

Sprint says it’ll support Wi-Fi calling on the iPhone 6, iPhone 6 Plus, iPhone 5C, and iPhone 5S beginning today. The new iOS 8.3 update today made support of Wi-Fi calling possible on newer Apple phones. T-Mobile added Wi-Fi calling for its iPhones last year.

The addition of Wi-Fi calling also underlines that cellular networks in the U.S are still far from ubiquitous and that a backup network is valuable. The carrier says it now has 25 smartphones in its lineup that can do Wi-Fi calling.

Sprint’s iPhone customers will receive a software update sometime during the next week, which will enable the phones for Wi-Fi calls. Users will find a switch for toggling the service on and off in their phone’s settings.

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