Check spelling in Numbers on iPhone
Spelling errors are corrected as you type, unless you turned off the Auto-Correction setting for your iPhone. If you turned off this setting, you can still flag spelling errors as you enter text in Numbers spreadsheets. You can also add terms to the dictionary so they’re not marked as misspellings.
Note: Spelling is checked according to the language of the keyboard you’re using, not the language of the spreadsheet.
Check and correct spelling
Go to the Numbers app
on your iPhone.Open a spreadsheet.
Tap
, tap Settings, then tap Auto-Correction.Turn on Check Spelling, then tap the sheet to close the controls.
Misspelled and unrecognized words are underlined in red.
Tap a misspelled word, then tap the correct spelling.
Note: To check and correct spelling in another language, press and hold 
at the bottom of the keyboard, then choose the language you want. If you don’t see the language you want, you may need to add it to your iPad’s preferred language list. To learn more about how to add another language to your device’s preferred language list, see Set up a keyboard or other input source for another language.
Add and remove words from the spelling dictionary
Go to the Numbers app
on your iPhone.Open a spreadsheet, then do any of the following:
Add a word: Tap the underlined word, then tap Replace, then tap Learn Spelling. The word is added to the dictionary used by Pages and other apps.
Remove a word: Double-tap the word in your spreadsheet, tap
then tap Unlearn Spelling. The word is removed from the dictionary used by Pages and other apps.
Note: If you add a word to the spelling dictionary, it’s added for all languages.
Turn off the Numbers spell checker
Go to the Numbers app
on your iPhones.Open a spreadsheet, tap
, tap Settings, then tap Auto-Correction.Turn off Check Spelling.
If you don’t want words to be corrected as you type, turn off autocorrect. See the task below for instructions.
Turn off autocorrect for your device
When autocorrect is turned on, misspelled and unknown words are automatically corrected as you type. Turning off autocorrect applies not only to Numbers, but to other applications where you type text, such as Mail.
On the Home screen of your device, tap Settings, then tap General.
Tap Keyboard, then turn off Auto-Correction.