AT&T recently filed a complaint with the FCC over WiFi calling services on the iPhone, which it says it cannot offer due to certain regulations. AT&T competitors Sprint and T-Mobile have offered WiFi calling for the better part of a year, and AT&T insists they are doing so against FCC regulations. "AT&T intended to introduce WiFi calling services [on Sept. 25] in competition with ... T-Mobile and Sprint," said AT&T in its filing. "Those carriers have been offering WiFi calling services for a significant period of time. Neither of those carriers has approached the FCC to request a waiver of the TTY rules. Because the commission has not granted AT&T's waiver petition, we are not in a position to provide WiFi calling services to our customers even while our competitors provide those services in defiance of the commission's rules." AT&T requested a waiver from the FCC in June, but is still waiting for approval. AT&T says WiFi calling is not 100% reliable with TTY technology and wants to use RTT technology instead. Technically, AT&T says the FCC has to approve the technology switch before it can offer the service and remain in compliance with the law. In a rebuttal, T-Mobile said RTT technology is not necessary and the company has thus offered WiFi calling since last year. "AT&T urges the commission to seize this opportunity to grant AT&T's waiver request without further delay," said AT&T. "Doing so will enable AT&T to offer its customers Wi-Fi calling capabilities and correct the asymmetry that today exists between AT&T and its mobile services competitors." iOS 9, which Apple recently distributed to iPhone owners, has built-in support for WiFi calling. AT&T customers are unable to use the service, however, until AT&T gets the waiver from the FCC.


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