“…The telephone survey has various advantages, such as low operational cost and rapidity in the process of divulging results, compared to the Household Survey. 16,17,22 However, existing scientifi c production brings to light three main questions: (a) the validity of estimates obtained in the Telephone Survey, due to the exclusion of household without a landline, 2,4,11,18,b,c (b) the increased lack of response 9,d and (c) the methodological procedures for obtaining valid estimates. 11,12,14,c The experience of VIGITEL in Brazil differs from that of other countries, such as the Behavior Risk Factor Surveillance System (BRFSS) d in the United States, with regards to the levels of no response.…”