I wanted the PPP details from my modem so I could use them with a better device. You can easily see the PPP username in the admin page of the modem, but it doesn't give the password.
First I thought to look in the modem's config settings backup, to see if the password is in there. It's not plain text, it's encrypted, and so is the username. I have no idea how to decrypt them, and the method below is easier and faster anyway.
The modem's software version is 8.4.4.J. I don't know if it works with different versions.
- Go to the modem's web interface. Mine is at 192.168.1.254, the ip of your device may be different.
- Go to this screen: (Home -> Broadband Connection -> Internet Services -> Internet) (Your connection may not be called 'Internet')
- Click the disconnect button, the page should refresh and show that it is not connected now.
- Bring up the 'Inspect Element' tool (right click), or simply view the source code of the page - and you will see your password!