Comment by justsomeadvice0

IIRC macOS got rid of privileged ports for these reasons. Dunno about iOS... But in any case what cell provider is going to let you handle inbound traffic? Most of the wifi networks you are on are NAT'd, etc. At best you'd probably want an outbound persistent tunnel that is "terminated" by a relay elsewhere. At that point you might as well just have the relay host the thing.