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Four-strand wire supports up to two phone lines.
The best way - although also the most risky - would be to disconnect the cable and use it as a draw string to pull through a CAT5E or CAT6 cable ideally 2and use that instead.
Description: Installing a New Phone Jack. In most cases, it's easiest to run the cable through the basement or crawl space, drill a hole in the floor underneath the jack and pass the cable through the hole.