interviewers ask to speak with the youngest adult of the opposite gender, who is now at home. This method of selecting respondents within each household improves participation among young people who are often more difficult to interview than older people because of their lifestyles. Unlike a landline phone, a cell phone is assumed in Pew Research polls to be a personal device. This means that, for those in the cell sample, interviewers ask if the person who answers the cell phone is 18 years of age or older to determine if the person is eligible to complete the survey. What if I only have a cell phone -- am I represented in your surveys? Nearly all of the surveys conducted by the Pew Research Center now include people who only have cell phones (see About Our Survey Methodology in Detail for more information). As the proportion of Americans who rely solely or mostly on cell phones has continued to grow, sampling both landline and cell phone numbers helps to ensure that Pew Research surveys represent nearly all adults. However, there are several challenges and extra costs associated with sampling cell phones and conducting cell phone surveys . Don't you have trouble getting people to answer your polls? Yes. The percentage of people we interview -- out of all we try to interview -- has been declining over the past decade or more. There are many reasons for this. Some stems from the fact that people are busier and harder to