The CDC often relies solely on landline phones when conducting large , state-based health surveys , conducted every year to determine sexual habits , childhood immunizations rates , and dozens of others factors related to American health . ` the Centers for Disease Control and Prevention relies on landline phones for health surveys , conducted every year . Survey used for national health policies for health insurance , immunization and etc . 5 percent of Vermont were cell phone-only homes ; Oklahoma had 26 percent .
the Centers for Disease Control and Prevention relies on landline phones for health surveys , conducted every year . Survey used for national health policies for health insurance , immunization and etc . 5 percent of Vermont were cell phone-only homes ; Oklahoma had 26 percent .