The /etc/ppp/options file on your Nokia device is a text file with configuration options used by DUN. There is a line in the file that looks like this "#-chap". The # character needs to be removed.

Aleksandyr gave good instructions for one approach to do this, but I'm not sure why he thinks an external memory card is needed. An alternative approach, that I think is easier, is to SSH into your local device as root. You can do everything on the N810 device itself if you want, and it doesn't require installing becomeroot/gainroot. e.g.

1. Install OpenSSH from main repositories. At end of install, it will prompt you to change the password for the root account on your device. Unless you know what you are doing, make sure it's a good password and don't forget it.
2. Start X Terminal on the device. (Apps->Utilities->X Terminal). At the prompt, type "ssh -l root localhost". Enter your new root password to login to your device as root via SSH.
3. Now, edit the /etc/ppp/options file. Easiest way for me, was to use "vi". If you are not familiar with vi, it goes something like this:
   • Type "vi /etc/ppp/options"
   • Type "i" (this puts you in to insert mode)
   • Use the D-pad to find the line "#-chap". Delete the "#".
   • Press <Escape>. Type ":wq". This saves the file and exits vi.

Aleksandry could very well be right. However, it seemed less risk to me to use 1X only than it would be to hack the phone to allow access on the EVDO network, especially since I'm not paying for VCAST currently. Based on Aleksandry's comments though, I"ll probably leave my phone in hybrid mode most of the time, and only switch to 1X only when needed. (Which will be rare for me.)

It brings up a larger issue and question I have though that maybe someone can help with... The hack linked to above (which is referenced in various forms all over the Internet) seems to give access to the EVDO network via DUN without Verizon's approval. However, if I pay for VCAST (or some other data option plan from Verizon), can I then use my phone via Bluetooth for DUN legitally? Said another way, could I then access the Internet WITHOUT having to make the login hack above on my phone (even if meant going to the local Verizon store so they could reconfigure something)?