Hey there, KatieBetch! Definitely want to look into this for you. Can you tell us more about the upgrade that you are referring to? Do you mean the IOS version?
We understand. In that case you would need to purchase the new phone. At the moment we do not offer an exchange program online. However, you may contact one of our stores to confirm if they would accept your current device for a discount. You can find your nearest stores and their contact information in this website http://boost.co/1KqSinD.