AT&T: Sprint and T-Mobile defies FCC rules by launching Wi-Fi calling
In a letter to the Federal Communications Commission, AT&T accused Sprint and T-Mobile of offering wifi calling on mobile without approval from the agency for teletypewriters (TTY). People with hearing and speech disabilities use TTY to transmit phone calls for 911 and emergencies. AT&T noted that Sprint and T-Mobile have been offering wifi calling services…
