Telephone jacks are devices which allow connectivity of your phone with the phone line. Some phones haves this jack in-built, but not all have this kind of feature. A jack is necessary for connecting phone with line. Telephone Jack SS304 is a jack which allows connectivity of your phone with the supply line and keeps you connected with the entire world. You can order a Telephone Jack SS304 from Sam Stores. This jack will give you an excellent connectivity. It is a modular jack and can be fixed with the wall very easily.