How do I see my old snapchat information without knowing the password or username
How do I get my old Snapchat account back without knowing the username or password
I would say you don’t. To access your Snapchat account obviously you’d need to know your user ID and password to access that account. So you should be contacting Snapchat about a forgotten account with their service. Apple does not own Snapchat and has nothing to do with your account with SnapChat.