Was the sample random? Was the sampling method unbiased?

Have you ever pretended to be talking on your cell phone in order to avoid interacting with people around you? Is faking cell phone calls a common practice among cell phone users? A survey conducted by the Pew Research Center during April 26–May 22, 2011, asked cell phone users about this issue and many others regarding the respondents’ cell phone usage in the past 30 days. The survey involved selecting a random sample of 1,858 American cell phone users