Your mobile internet is behind NAT and your WiFI router would need port redir to point external traffic to the phone inside the LAN anyway. So even if you can

Your mobile internet is behind NAT and your WiFI router would need port redir to point external traffic to the phone inside the LAN anyway. So even if you can run it at port 80 you can't really do that without NAT or tunnel somewhere and if you need that you can just NAT to get it visible on 80 from the outside It's mostly imaginary problem