One of the biggest causes of smartphone battery drain is the mobile data connection—particularly if you live in an area with poor reception. But, chances are, you don’t actually need this connection most of the time, because you’re probably connected to Wi-Fi for a good chunk of the day, which uses far less battery life.

Nonetheless, even when your phone is connected to a Wi-Fi network, it still maintains its connection to the cellular network so that you can receive phone calls and SMS messages. Yet, many carriers—AT&T, T-Mobile, Sprint, and Project Fi, among others—offer Wi-Fi calling these… more

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