Thanks Ian that's exactly what I needed to know!
Guys sorry for being a bit vague in request, I haven't connected either device to the live line yet, just want to get my ducks in row first.
Allenlux apologies for hijacking your thread. I was in a similar situation, which one should I get? I just wanted a standalone modem, I couldn't find any more than the ones you have mentioned and after reading reviews (including many customer reviews) and a little research suggests the HG612 is better value for money, is reliable, and doesn't breakdown after 4 months use and it should do the same if not a better job than the Vigor120 and holds the line better than the 8816. I picked mine up on the bay for £9.00.
I'm not a massive BT fan especially with regard to their firmware policies but I can't fault them on the hardware it either conks out straight away or lasts for centuries. And this little huawei promises to deliver a lot..
Thanks again guys,
1)basic>ATM then enter the settings in the pic ATM pic
2)Basic>WAN WAN Settings
The username and password in your asus router here