Last week, we told you how AT&T felt that it had been treated unfairly by the FCC. While the carrier decided to play by the rules and wait for an FCC waiver before offering Wi-Fi calling, Sprint and T-Mobile went ahead without a waiver, and started offering the service to its customers. AT&T filed a waiver in June, requesting that they be allowed to proceed with Wi-Fi calling without offering TTY service over Wi-Fi. This is a teletype service used by the hearing impaired to type out phone calls to each other. AT&T is working on a replacement service called RTT (real-time text).
Yesterday, …
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