This new initiative allows users to send a text to 999, which will then get converted into a call to the relevant emergency service call centre. This means that caller ID and location information are available to the emergency service in the same way as for voice calls from a mobile.

This service represents a major breakthrough for RNID. The charity has been working with partners to develop this vital service for many years. The service is being supported by the Government, emergency services, Ofcom, the telecommunications sector (British Telecom, Cable and Wireless, Vodafone, Orange, O2, T-Mobile and 3) and RNID.

Guido Gybels RNID's Director of Technology said: "Access to 999 could literally be a matter of life and death, yet until now many people who are deaf or hard of hearing have found themselves unable to contact the emergency services while on the move."

"This pilot service therefore represents a major step forward and we hope that as many people with hearing loss as possible will register and take part. In doing so, they will help to make sure the best possible service is developed."

The service has already handled over 100 real emergency calls and recently the number of registrations topped 4,000 – but RNID still need more people to sign up to help them fully develop the service. 

Before you can use the service you need to register your phone, to do this text the word 'register' to 999, then follow the instructions you receive. Alternatively, you can register online at www.emergencysms.org.uk (external link)