Phone keeps switching to numbers randomly on ABC keyboard

The phone may need a screen replacement if the numbers really are appearing when you are typing letters.

$29 (U.S) if you have AppleCare+

$279 (U.S.) if you don't

Make an appointment at the Apple Store or take the phone to an authorized Apple service shop. You can find a list of authorized service shops in your area by using the link just below.

Find Locations

By chance, might you accidentally be tapping the 123 key, which will switch the keyboard from letters to numbers?