How to take sos off my iPhone

Do you mean the Emergency SOS calling function activated by holding volume and side buttons?

-or-

Do you have a signal indicator "SOS" instead of your network name at the top of your screen? This means you don't have a network signal from your Home network, or your SIM is not valid on the available networks.

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Try this: Go to setting - Emegency SOS -> turn Off the options.

Emergency call no longer uses automatic countdown timer on the latest iOS version. Probably because weaklings were instead hitting the button multiple times while trying holding it once to force a poweroff.

Emergency Call now requires an ADDITIONAL screen swipe to activate, so if you thought activating your last perk was still going to summon EMS, sorry Charlie.