SSH (Secure SHell) is a network protocol that allows one computer/device to securely connect to a destination device (the iPhone in this case). Once connected to can see the file system of the target iPhone, copy/move/delete files and folders, and more. On Mac OSX you can use Cyberduck to easily establish a SSH connection.

Download and launch Cyberduck, then set the connection options as follows:

• Host/server: the iPhone's IP address (refer to this FAQ to discover how to retrieve it)
• Username: root
• Password: alpine
• File protocol: SFTP

Finally click Login and you should be connected to the iPhone. You can then start browing the iPhone's content, copy files etc.