Sprint may become the second major US carrier to let its customers make phone calls over Wi-Fi.-According to Android Central, Sprint appears to be planning to support Wi-Fi calling on two existing Samsung smartphones and for all new devices running Android 4.2 or higher going forward. Phones won't be able to transition from a Wi-Fi call to a cellular call though, so leaving Wi-Fi coverage in the middle of a conversation would leave you with a dead line. There's no word on when the service will be announced, but Android Central has received training materials that Sprint is allegedly distributing in preparation for launch. The materials show that text messages can also be sent and received over Wi-Fi, though they don't mention if messages will count toward a service cap.



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