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Factory reset should be last resort when iPhone has problems

When an iPhone develops errors, users do not need to jump straight to a reset. Troubleshooting options range from a restart to resetting all settings and, finally, erasing all content and settings. A restart does not affect personal data, while resetting settings keeps files but clears items such as Wi-Fi passwords and Apple Pay cards. Erasing all content deletes all data and settings and should be used as a last resort or before selling the device.