Well there goes my idea. I think on my older phones like the LG Shine, it would auto correct to "Okay." Realistically I'm just remembering what I want to remember though.
Appreciate you checking that. Didn't even cross my mind to do it on my phone right by me.
I use 'kk' a fair bit to indicate acknowledgement, over affirmation.
Your phone idea might be on the right track tho - for those of us who are so old that we used SMS before T9 was invented, typing 'kk' would be way quicker than 'ok'.