When you reset your iPhone, all of your data will be saved. When you acquire another iPhone, everything will be as it was before.
Tap Reset all settings to restore your device’s factory default settings. Open Settings, swipe down, and then choose General. Select Delete. To reset all preferences back to their original state without deleting your data, tap Reset All Settings again. Swiping away from the top-left corner of the screen brings you back to the Home screen; swiping up.
If you delete a photo on your iPhone, iPad, or iPod touch using iCloud Photo Library and don’t use the Photos app, it will be removed from both locations. If you reset your phone as described in What to do before you sell or give away your iPhone, iPad, or iPod touch – Apple Support, however, your photos will not be.
A factory reset or hard restart erases all of your iPhone’s data and settings. All of your photos, movies, contacts, phone logs, passwords, messages, surfing history, schedule, chat history, notes, applications installed on the device are erased. It cleans the iPhone like a new machine with no personal information left behind.
When you wipe all of your content and settings, it thoroughly reinstalls your device. All data, including applications, photos, videos, contacts, messages, calendars, or music files are lost. To recover your iPhone after a factory reset using iCloud or iTunes, first take a backup of your data.
