Once you’re set up and ready to make calls, these are the prefixes you need:
To make emergency calls: 18000
If you have trouble hearing/speaking: 18001
To call someone who has trouble hearing/speaking: 18002
The person you’re calling doesn’t need the Relay UK app to receive a call from you using text relay. However, if you need to call someone else who also has trouble speaking or hearing, then they can get the app as well and you can make a call where a Relay Assistant will type for both of you (text-to-text).
By using the Relay UK app you can communicate using text direct with other people if they have the app or a textphone. If they don't, a Relay Assistant will be automatically connected to relay your call.