Why T-Mobile needs Wi-Fi calling: its network can't match AT&T and Verizon - Ars Technica

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Why T-Mobile needs Wi-Fi calling: its network can't match AT&T and Verizon
Ars Technica
Wi-Fi calling should improve reliability in regions with poor cellular coverage. It won't help prepaid T-Mobile customers manage calling limits, though. T-Mobile's current postpaid plans include unlimited minutes, and customers on older postpaid plans ...

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