CDC relies on landline phones for health surveys , conducted every year . The phone numbers are provided by the local telephone company and they have a database of all calls made to that number in their system. 26 percent of Oklahoma were cell phone-only homes ; Vermont had 5 percent .
CDC relies on landline phones for health surveys , conducted every year . Survey used for national health policies for health insurance , immunization and etc . 26 percent of Oklahoma were cell phone-only homes ; Vermont had 5 percent .