Phone lines were jammed?

This student reports the phone lines were jammed. Does that include cell phones? [+] I thought phone companies had solved the jammed phone line problem. What is this, the 1920's? Why would the phone lines be jammed anyway? Students making emergency 911 calls? On cell phones? Students mainly have cell phones these days and no landline phones, don't they? This jammed phone line bussiness needs to be double checked.