*** Live calls by professional phonebanks increase turnout a bit. High quality, thus higher cost calls (i.e., by well trained staff who can engage people), are more effective, although the increase only averaged about 1.4% of those who were contacted (i.e., 1 vote for 71 contacts) in available studies.
(Green & Gerber, 2023) (Loewenstein, J., Newby, R.)