Returning a company i-phone. Would like to remove personal info. Should I reset all settings or erase all content & settings advice

Returning a company i-phone. Would like to remove personal info. Should I reset all settings or erase all content & settings advice

Go to Find My iPhone and remove the phone from the list of your devices. Then use the "Erase All Content and Settings" tool on your phone. Finally, check that your iCloud account no longer lists the phone and then remove and discard the SIM. If your company insists on getting the SIM back then take it out, pop the SIM in a microwave oven on any power setting for half a second and then re-insert the now useless SIM.

Erase all content and settings.

Yes. Completely wipe the phone and if it is their SIM, clear that as well.

Erase all content.

Resetting the settings, does just that. Accounts would be still signed in.