Kali Linux has to be correctly installed and on its newest Version.
The iPhone that you will be going to hack has to be on the same network as you.
To start armitage just put in "armitage" in the command prompt and hit enter.
A Login Dialog will show up and without changing anything press Connect.
Another Dialog will show up and you just press "YES".
For Kali Live Users:
Before executing the command above you have to execute two commands in the command prompt:
service postgresql start
When everything is finished loading, press the Hosts button and Add Host.
In this Text Window you put in the Ip Address of the iPhone.
If you don´t know the Ip-Address you can scan the network with nmap or zmap.
Note: This exploit only works on jailbroken iPhones.
Go to Section exploit > apple_ios > ssh
Click on cydiadefaultssh
In the RHOST Section you put in the Ip-Address of the iPhone.
When everything worked fine you should be in a command prompt and from now on you have full controll over the iPhone. PS.: It´s a Bash Terminal.
If you don´t know the basic commands in Bash just watch a YT Tutorial.