There are many file browsers for Windows and MAC to browse files on iPhone.
I was looking for a ways to browse files on my iPhone using Linux.
Now Nautilus file browser on GNOME Desktop supports sftp protocol.
Since, I have already installed OpenSSH from Cydia on my iPhone it was just easy to browse files on iPhone using Nautilus.
I use sftp://mobile@[iphone IP]/ in the Nautilus Address bar and Nautilus prompts for my password. Once I give correct password I am able to browse my files on iPhone.
Tip: Do remember to change your default iPhone password (alpine) for users mobile and root.