DIY Home Telephone Wiring - Easy A lot of people shy away from home telephone wiring. They may think that they are not allowed to touch the existing ones. This is not so. Your local phone company will come and do your wiring for you, but it will cost you. Wiring a jack is not difficult and it is totally fine to add a new jack or internet phone jack Telephone Wiring Diagram - Ask-The-Electrician Wiring a Telephone Jack After installing the Cat 3 - 3 pair phone wire I am ready to install the wall jack. You will have a wide variety of telephone jacks to choose from but the wiring for a single line phone service will be standard.