My telephone wire has blue, yellow and red, no black - how do I connect them to the phone jack? Thank you very much.

Maybe use just the red and blue at both ends, You are in the US?

Thanks for the reply, I am in Canada, what do you mean 'at both ends'?

One end is where the Jack is and the other end connects to Telco. Both ends must match. Will try to do a quick search of Canadian wiring.

Moving wiring and repair- bell.ca
Connect Red to Red and Blue wire to green on jack.