Gallup Daily tracking is made up of two surveys: the Gallup U.S. Daily political and economic survey and the Gallup-Healthways Well-Being Index. For both surveys, Gallup conducts 500 interviews across the U.S. per day, 350 days out of the year, with 70% on cellphones and 30% on landlines.[41][42][43] Gallup Daily tracking methodology relies on live interviewers, dual-frame random-digit-dial sampling (which includes landline as well as cellular telephone phone sampling to reach those in cell phone-only households), and uses a multi-call design to reach respondents not contacted on the initial attempt.