Hello everyone.
Im having a really hard time establish a connection to my arduino.
Ive maneged to control it inside my network, but i cant do it when im on 3G 
Please help me because i cant find a guide for it anywhere.
Thanks
You want to get to your Arduino from the internet ?
The router has to open a port and that should forward to the Arduino. Search for your router model and the term "port forwarding".
Your 3G is not connected to you home network. I assume that if you have wifi, it will connect to your home wifi. And that is within your home network and should be able to connect to your Arduino. Unless you a a few different subnets.