If your Internet provider use the NAT architetture, then your haven't a IP public, you cannot use the usual setting (open fowarding port in your router, set DDNS service etc).
In this case (or if you wan't to use the normal architetture) you must use the IP Web Cam with P2P (only if your ip web cam support P2P).
Use the P2P is very easy.
Install in your smarphone the App of your Ip Web Cam, set in manualy mode or using the qrcode the
UID of your cam and add the login and password and you have finished.
(Before you must to register in the cloud application of your IP Web Cam).
Very easy.
No, fowarding port, no DDNS service, nothing else.
