Deaf people are now able to make 999 calls for the first time via a new emergency video calling service with sign language interpreters.
The deaf community hailed the advance, which has its official launch tomorrow as a breakthrough that would save lives and a step towards equality.
The new 999 BSL (British Sign Language) service allows deaf people to communicate in their first language.
Ofcom announced a new requirement for telephone and broadband companies to offer the free, 24-7 video call service for BSL users last June. They estimated that it could save two lives each year.
It operates via a dedicated mobile app and website. Callers are put through to a BSL interpreter, who then contacts a 999 operator to relay the conversation.