Hard reset htc sensation z710e ?

iphone 4s one week old
black iphone 4s 16gb on orange just a week old as new, no offers. please dont email asking me to reply via another email address as i wont. no paypal and i wont post cash on collection only. text or call for details 07872065285 finally dont text asking best price as again i wont reply its 300 nothing less im in Rugeley near cannock