Relay UK

Does anyone here use the Relay UK service to manage phone calls?

I can't use a phone the normal way because I have auditory processing issues. I can't translate the noises coming out of a phone into words when I don't have any visual info to provide context and clues. Lots of services refuse to deal with me in any way other than by phone, even after being informed of this, or sometimes there is no way to inform them other than by phone call.

I've just signed up for a TextNumber with the Relay service. Is this the number I should give to services now? What if they need to send me an SMS? Can my TextNumber receive SMS?

If I use call blocking to reduce spam, will it also block calls coming through my TextNumber?

I'm hoping this will be useful for appointment booking etc as I can write what I need to say in advance, paste it in during the call, and then save the call transcript, rather than having to think, listen, speak and write down info at the same time, or memorize scripts.