Is there a version of Nortel Tunnel Guard for Android tablets or phones?
No, the software is not available for Android tablets. This needs to be used on a supported platform like Windows. For Android, you can use OpenVPN as a client to connect to various VPN services or use pre-made VPN applications like TunnelBear.
You can download the OpenVPN client through the following link: https://play.google.com/store/apps/details?id=net.openvpn.openvpn