I've been typing Dvorak on my computer since middle school and so I thought it'd naturally be a good idea to switch my phone... turns out not so much. While having all the common letters on the home row is good for regular typing, it is not good for phone typing which is heavily dependent on autocorrect. If I miss a letter by one key it's still likely for it to be a valid word because common letters are clustered and autocorrect misinterprets. For example, I might type "i" and then "t", "n", and "s" are all adjacent meaning if I meant to type "is" and I miss by one key and type "in" then it is not corrected. Other annoying ones are "by" and "my" because the b and m are next to each other.
Sadly, I'm in a bit too deep to go back to Qwerty on my phone (I'd be very slow for awhile). I do still enjoy Dvorak on the computer and while I don't think I'm a faster typist than I would be with Qwerty, I rarely (pretty much never) experience finger strain when typing for long periods.
Supposedly the entire reason Qwerty was designed was to prevent typewriters from jamming by making the keys as disambiguous as possible, which is now ironically ideal on tiny screens.
I switched to Dvorak in the early 2000's and typing qwerty on a keyboard is totally alien to me now.
However, any attempt at using Dvorak on a touch screen keyboard has failed as I can't rely on my muscle memory.
I found that for touch screen input I preferred using qwerty since I have a better feel about where keys are to hunt and peck. Funnily when typing dvorak, my fingers knows where the keys are but I don't have a good conscious mental map of the layout.
Maybe it's due to the fact that you have to touch type dvorak without any visual help since most users use regular qwerty layout keyboards.
Can vouch for colemak being hard to type correctly with on a phone. Normally with qwerty I felt I didn't rely so much on autocorrect, but with Colemak I make certain mistakes quite frequently. Especially given eio are all next to each other a lot of times when I want to type o I type "i" instead. I think it's gotten better in recent months but certain combinations on Colemak just seem to be very sub optimal for a phone. Especially the placing of the vowels.
I'm used to it now and it doesn't quite bother me enough to relearn qwerty on mobile. Kinda stuck in this weird limbo of relying on autocorrect for every 5th word. Hahaha.
Sadly, I'm in a bit too deep to go back to Qwerty on my phone (I'd be very slow for awhile). I do still enjoy Dvorak on the computer and while I don't think I'm a faster typist than I would be with Qwerty, I rarely (pretty much never) experience finger strain when typing for long periods.