Are there any costs to using MobileDay's conference calling service or call line? Patricia August 10, 2016 17:59 Follow Nope, all MobileDay’s services are totally free. This includes our conference call line and the one-touch dialing app. Related articles How many people can use my MobileDay Bridge? What is MobileDay Business and how does it differ from MobileDay Pro? Comments 0 comments Article is closed for comments.