Your question is extremely broad.
For starters, I'm already starting to assume you believe the ticket was for talking on your phone, when it's not that simple. The charge is not limited to talking on your phone. You can be holding your phone receive the same ticket. The officer has no obligation to prove that you were in a conversation. So were you holding your phone at all? Was it mounted?
Your ticket is not going to get "cancelled". You can start by looking at the options available on your ticket. There will be one for having your case heard in a court room. You'll go to the court house and fill out a form letting them know your intentions. You'll wait until they send you your court date in the mail. From there, you can make a disclosure request. If you don't know how, you can check the municipalities website where you got the ticket. They'll have a form you can fill out.