I must admit that spelling is a bit of a pet peeve for mine, I see way too many people on the internet just not bothering at all, i don't understand why. I hope these people don't do the same thing when writing formal letters.
I am guilty however of not considering the person is dyslexic even though I no longer bother to comment on it; someone has pointed out this out to me in the past and I felt mean and dumb for not thinking of that to begin with. So lesson learnt.
I don't know why I'm telling you this.
But yes, I have troubles with my words quite often. Misplacing words, using do instead of go and vice versa so I'm not perfect. I also don't proof-read enough. So none of us are perfect, don't feel bad about it, especially since you have a very legitimate reason for it. You could even put it in your signature on this forum if you wanted to. I know you mentioned you use for phone instead of a computer but just in case you also use a computer, there are multiple web browsers that have grammar and spell checks built in that work similarly to Microsoft Word, Chrome being the best at this feature. I don't know if that feature extends to the mobile version, might be worth a check. Just thought I'd throw that idea in there for you.