BOULDER, Colo.--(BUSINESS WIRE)--MobileDay, creator of the one-tap conference call dialing app, announced today that its core user base has now made over 10 million calls using the MobileDay app. In the first half of 2015 alone, more than 2 million mobile calls have been made using MobileDay with 71 percent of all calls coming from users at companies with more than $1 billion in revenue. Following a huge surge in the number of conference calls placed on the app in 2014, MobileDay’s 10 million c