<meta name="viewport" content="width=device-width, initial-scale=1.0">to your index html, you should get that on your phone! :)
/profile/cardwich is a convention you MUST NOT rely on. Always dereference the WebID whatever it is
profile/cardis just a convention of NSS but a profile document can have any URI. In general do not rely on naming conventions, always follow links when working with solid / linked data.
unknown.Contacts.json. Don't know what this file is good for, it does not exist