Many deaf and hard of hearing callers must still use a teletypewriter (TTY) text telephone device or a telecommunications device for the deaf (TDD) to contact 911. Invented in the 1960s, these devices are cumbersome and slow to operate.
Many deaf and hard of hearing callers must still use a teletypewriter (TTY) text telephone device or a telecommunications device for the deaf (TDD) to contact 911. Invented in the 1960s, these devices are cumbersome and slow to operate.