Hi, my iPhone 5 still has the "WPA2 WiFi" issues and am planning to get it exchanged for a refurbished (or whatever they give me). I ordered it online and threw away the receipt that came with it in the package. Will I be fine just bringing my iPhone and its box and contents without the receipt since it has a limited warranty of 1 year? Do I need to provide any credit card (in hand)? Or will the exchange be free without any financial requests of information (as my parents are not with me since I am in Uni)?