Wouldn't just using a messaging app work just fine? Like a lot of us use screen readers already so you would have no issue reading our things and I have no issue reading your question here either.

There's a deaf/blind client at our state center for the blind, and he uses a braille note connected to his phone via bluetooth to communicate with others. Granted, without his phone number then you're not quite getting into his social circle but the available technology makes it possible to bring his world and ours together.
I'm always impressed by his drive because on the few client trips we've made (for things like skiing and rock climbing) he's right there with us having a good time.

Today I would use $1 but in the past we have used text messages and in the deep dark past notepad and paper and finger spelling in to the palm.

i can't really answer it from the perspective of a fully blind person but i do have an experience that sort of seems relevant.

i was on a bus going to manchester, a Deaf man asked me, is this bus going to Manchester?

trouble was.. i had no clue what he was saying. he repeated himself for me, i still couldn't understand...

i pull out my little notebook computer and get it ready for him to type into it.

he gets so incredibly angry at me and storms off, sits down, and ignores me.

i had no clue what i had done wrong.

that was a defining moment, which caused me to study british sign language and get my level 2 certification.

i remember the event so clearly that i can understand what he said... bit late now though i guess.

i learned during studying bsl that many Deaf people have such a strong identity to being deaf that they don't necessarily know how to read or write in English.. so it probably felt like i pissed in his cornflakes when i pulled my laptop out, never meant to insult him, obviously.. but my lack of understanding was probably quite offensive.

My favorite media piece about blind and Deaf people chatting is a video by Tommy Edison and Rikki Poynter. Here’s the link to the YouTube video in which they discuss this very question:

https://m.youtube.com/watch?v=5ff1tm1AhZg

Haven't had this happen yet, my first instinct would be to trade phone numbers (perhaps by showing the digits on my fingers, or turning my screen on and typing it into the notes app) and then communicate by texting instead.

I'd dictate into my iPhone and then have them read it on the screen. If they also have a smart phone, then we'd exchange numbers and there you go.

My father is legally blind and legally deaf.

Communication is difficult. Especially since he doesn't want to use many aids

I know tactile ASL but that’s not super commonly taught to deaf people I think? Id probably just use notepad and voiceover

I’m blind, via text dot dot dot

Probably messaging back and forth or something, unless you don’t have their number or way to reach them. I’ve done it briefly at an event through an interpreter. I had an uber ride with one which was pretty awkward I could have probably texted them through the uber appp. But she got off the car because I had marked the location and helped me to the coffee shop. Funny funny thing was she shared my name.

Assuming both entities are at the greater ends of the spectrum? Text message probably. But otherwise I've met at least two deaf people who've had some sort of capability to hear a little. The combination of what little they could hear and reading lips. Plus them being able to mostly coherently articulate what they're trying to say. We got by communicating alright. I'm sure sign language is probably easier for them personally and not needing to repeat themselves constantly. But that's been my own personal experience. There's always a way no matter how deaf or blind peeps may be.

I have a deaf friend who lives in another city. When we are far away, we communicate through written messages on WhatsApp or video calls. I have to be in front of the camera speaking slowly so that he can read my lips and then respond to me but when we are together in person everything is easier, I just need to be in front of him and he understands what I say because he reads my lips.

I would be interested in learning tactile sign language. Any free online resources?

I know the basics of Brazilian sign language, so I usually don’t have much trouble. But I know some deaf people don’t use sign language for various reasons and I honestly don’t know how I would approach these situations.

Assuming they can still see and understand english, i mean why not? lol, I'd just write everything down. Infact why is there even sign language now that i think about it🤔. Is there a reason we can't just use a normal pen and paper?

Anyways, somehow i love the idea of having to carry around those just to be able to communicate...lol :)

I lunchen regularly with a deafblind friend, I am totally blind. We communicate 100% via Braille display when in public because they are wary of being understood in company.

Probably electronic text. I really want to learn ASL but don’t know how that would work. I like linguistics and a non oral language sounds really interesting.
Morse also works assuming both parties know it. You can modify a headphone speaker to feel the diaphragm vibrate.