Ah, one more thing...with cellphones the usual is talk about "autocorrect", meaning the keyboard settings of auto-correction, then the correction suggestions and other keyboard settings.
Spelling checker would be more to the use of Chrome and when using other programs (applications/apps) like text processors and others.
Anyway, this is an answer from a layman, others may add something more to the discussion.Ref. damnyouautocorrect
Back to the crux then. You could say "Oh, I typed (the word you want here) and my phone changed it. I´m sorry! OR
I am afraid I typed (the word you want here) and my phone changed it!
Sorry...I meant (intended word) autocorrect fail!
Only find a way (or readjust your keyboard settings) not to be corrected again! And again and again!