Grazie per il feedback.
This could be due to the following reasons:
1. Your routers uPnP feature is Disabled.
2. Your Router is not getting a proper public IP address from your Internet Service Provider. *This is common if your ISP modem is actually a Modem/router combo"
3. Your Phone reception is weak
4. Your phone provider has a firewall which is blocking the mydlink (Stunt/Relay) connection.