nonononononononnonon do not do this. Against code nearly everywhere.
Just buy some CAT6 cable, run the cable up the wall to your bedroom and terminate it and install a wall plate. If you have a cable thats already there, you said a phone line, run it along side that.
Also rule of thumb is to always run two cables. Do it.
Here is my thread when I cabled my home to give you some ideas. http://linustechtips.com/main/topic/11148-the-day-i-cabled-my-home/#entry118953