You
do not want to allow your rabbit access to charged(plugged in) electrical cords. Not only does it pose a potential life safety risk to your rabbit as an electrocution hazard, but also to you and others in your home as an electrical hazard and potential fire safety risk. In fact there was an RO member that had a fire start in their house due to their rabbit chewing through the insulation of a plugged in electrical cord.
So yes, there are some things you can do to protect your cords. There is flexible electrical tubing, hard electrical protectors, you can use wire xpen or c&c cube panels to block access. Or keep the cord out of reach of your bun, which is what I would suggest for your phone cords. Because bun isn't going to stop doing this. It's an instinctual behavior for rabbits. Cords are like little sticks to them, and rabbits like to chew on sticks.
http://myhouserabbit.com/rabbit-care/bunny-proofing-your-house/
http://bunnyproof.com/
One other thing you can do to satisfy your buns chewing needs, is provide rabbit safe branches for your bun to chew on, such as pesticide/herbicide free apple, willow, pear branches.
http://www.medirabbit.com/EN/GI_diseases/Food/Branch/Branch_en.htm