No ATM detected and been told to test with another router

[#1]

I am a new account and cant get connected (currently using Tmobile to connect) the errror message is no ATM detected..support has suggested I try another router but i have to wait until a friend can bring one around...in the meantime can anyone suggest anything else to try?  Thanks in advance for any help recieved

[#2]

Different filter, cable from socket to router - if you have them available.
I assume you are plugged in to main socket or better still test socket?

[#3]

will get my friend to bring around various other cables and use the test socket when they do..really dont want to be caught out with £140 engineer costs over a bit of cable !!! if plusnet sends someone out