How to reset an iPhone without Losing data
To reset the settings on your device go to Settings >> General then scroll down and tap the Reset button at the bottom.
On the Reset screen tap Reset All Settings – Not Erase All Content and Settings – then you’ll need to verify you want to do it twice.
"Reset All Settings" simply means that it will reset the settings on your phone to their original state. You will not lose documents, files and any installed apps in the process.
"Erase all content and Settings" means that it will reset the settings on your phone and erase all documents, files and any installed apps in the process. Files backup to iCloud will howerver not be affected.
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