How can I do a total restore?

[AC Question]

Total restore

I have turned my phone on and tried calling my own landline and now want to return to the shop as unused. how can I reset so that there is not even a record that the phone has been switched on

 

[B. Diddy]

Re: Total restore

Welcome to Android Central! Are you outside of the return window? Most places don't care if you used the phone, as long as you're returning it within the window.