As long as you know your AMP login and ports 80 and 443 are correctly forwarded to your machine where AMP is installed, and you know your home IP address (if you have dynamic IP then register with a service like DuckDNS or Dyndns if you don’t mind spending a few dollars) then you should be able to connect from anywhere.
Even if you’re at home, simply test it’s working by taking your phone off wifi and just use mobile signal.