Are there any costs to using MobileDay's conference calling service or call line? Patricia August 10, 2016 17:59 Nope, all MobileDay’s services are totally free. This includes our conference call line and the one-touch dialing app. Related articles How can I add pauses to the sequence MobileDay uses to account for a cell booster or microcell? How do I directly dial in MobileDay? Comments 0 comments Article is closed for comments.