Question

How to do full reset on iPhone 5 ?

Answer 1

Step 1: Go to Settings > General > Reset. You will be asked for your passcode and Apple ID.

Step 2: After entering passcode and Apple ID, tap Erase All Content and Settings.

Before resetting your iPhone, you can make a fresh backup with iTransfer in case of data loss.

Answer 2

Go to Settings, General and select Reset and then select Erase All Content and Settings.

When you are there, then you have to read the options about your backup and your iOS account and that's it.