Unless you jailbreak your iPhone, the file system will remain off limits as Apple intended. Even so, many people who jailbreak their phones stop with Cydia. There are, however, a few reasons you might want access to the file system on your device. SSH allows you to do just that using a Wi-Fi connection and a suitable Mac or PC client.
It can come in handy should you need to install something that’s not directly available on Cydia, think beta apps, etc.
Here’s Cult of Mac’s how-to guide to get you started.

