AT&T: Sprint and T-Mobile are offering Wi-Fi calling 'in defiance' of FCC rules

AT&T said that it wants to offer Wi-Fi calling services on the iPhone via Apple's new iOS 9 software, but that it is still waiting for an Federal Communications Commission waiver on rules that require calling services to also offer options for deaf and hard-of-hearing users. AT&T reiterated its request for a waiver and blasted Sprint and T-Mobile US for offering Wi-Fi calling services without requesting waivers from the FCC's rules.