In this section, you will learn the basics to access your Arduino board from outside your home network. In other words, you will be able to use the iOS application through the mobile network to access your power plug behind your home router/firewall.
This section is provided for reference only because there are so many routers available in the market, and there are so many network configurations, that it is actually impossible to provide a complete guide. Anyway, with this brief overview of the matter, you should be able to configure your own devices.
The next picture shows the typical configuration of a domestic network.
Let's suppose that your IP addresses are: