I wish I had double-checked the contact name before hitting send! If only my phone hadn't autocorrected "Mr. Henderson" to "Mr. Handsome"!

Oh no, what a disaster! To express regret about a mistake that has already happened, use "wish" or "if only" + past perfect (had + past participle).

"If only my phone didn't autocorrect" would mean you wish your phone didn't have that feature in general, but "hadn't autocorrected" focuses on that one specific, embarrassing moment in the past.