Would it happen if I were to factory reset my iPhone?

See these support articles:

Restore your iPhone, iPad, or iPod to factory settings [with a computer] - "A factory restore erases the information and settings on your iPhone, iPad, or iPod and installs the latest version of iOS or iPod software."

Click here --> http://support.apple.com/HT201252

How to erase your iPhone, iPad, or iPod touch

"Learn how to wipe information from your iPhone, iPad, or iPod touch and restore your device to factory settings." Without using a computer. Does not reinstall iOS.

Click here --> https://support.apple.com/HT201274

It will go back to its original state from when you first bought it. Make sure to back up all your important files or data before you do the factory reset as it will erase everything from your phone.