How to restore iPhone to its original settings

Just make sure you backup your iPhone first (ado you can restore it later) and you iCloud info should remain intact.

How to back up your iPhone, iPad, and iPod touch - Apple Support

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

and follow the steps in the 'Remove your personal information from your old device' section of:

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

_elopez131 Said:

"How to restore iPhone to its original settings: Since I have to return my device I have to restore it to its original settings. But I’m worried that if I do that then I would loose all the information on iCloud as well"

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What to do:

Sign Out of iCloud on the iPhone, and all would be just fine. So, proceed with this link: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support