How to factory reset iphone?

To factory reset an iPhone, open Settings, select General > Transfer or Reset iPhone, tap Erase All Content and Settings, and enter your passcode or Apple ID password to confirm.3 Ways to Factory Reset an iPhone1.Factory Reset Directly via Settings:Method 1 (Standard).Open Settings, tap General, scroll to the bottom and tap Transfer or Reset iPhone. Select Erase All Content and Settings, tap Continue, enter your device passcode, and confirm the reset.2.Reset Using Finder or iTunes (Disabled iPhone):Method 2 (Computer).Connect your iPhone to a Mac or PC using a USB cable. Open Finder (Mac) or iTunes / Apple Devices app (Windows), select your device in the sidebar, and click Restore iPhone.3.Erase Remotely via iCloud.com:Method 3 (Remote).Log in to iCloud.com/find on any browser. Select All Devices, click your iPhone from the list, select Erase iPhone, and enter your Apple ID credentials to wipe it remotely.Factory Reset vs. Reset All SettingsReset OptionDeletes Photos, Apps & Media?Deletes Apple ID & Activation Lock?Best Used ForErase All Content and SettingsYes (Permanently wipes all local data)Yes (Disables Find My & signs out)Trade-in, selling, giving away, or major software glitchesReset All SettingsNo (All photos, apps, and data remain safe)No (Apple ID remains logged in)Fixing severe network, system bugs, or preference glitchesEssential Steps Before Factory ResettingBack Up Your Data: Ensure you create a fresh iCloud Backup or computer backup to preserve your photos, contacts, and app data.Turn Off Find My: Disabling Find My removes Activation Lock, which is required if you are selling, trading in, or gifting the device.Unpair Apple Watch: If paired with an Apple Watch, unpair it first to create a fresh watch backup automatically.