AT&T SVP James Cicconi complained today that Sprint and T-Mobile have started offering Wi-Fi calling without receiving the necessary green-light from the FCC. At the heart of the issue is the TTY (teletypewriter) service used by some with a hearing disability, to type out phone calls. AT&T says that neither Sprint nor T-Mobile received a waiver from the FCC for TTY support. The service does not always work on Wi-Fi.
On the other hand, AT&T developed an alternative to TTY called RTT (real-time text). The carrier says that it filed for a temporary waiver back in June, so that RTT …
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