You didn't share your PI's IP address. If it starts with 192 or 10 then that's not the internet IP.
Not only that but many ISP's block servers. As web master you have to know this.
Please help!!!! I have recently created a server using a raspberry pi 3, i am using it to host a small wordpress website. The problem i am having is i cannot access the site form outside my home network. If i am connected to my wifi at home the server is working no problem but if i try to access the site from my mobile phone network i'm getting a HTTP error 504, gateway timeout. As far as i can make out i have done everything correctly, i gave the pi a static ip address and gave my device a dynamic domain name I have also turned on port forwarding, apache2 installed and is running. When i ping pi from my pc while connected to my wifi i get a reply straight back no problem so i know the ip address is correct. Any help would be greatly appreciated.