There are a lot of reasons why a business, particularly a service oriented business needs their own mobile app. See the detailed facts here http://www.intelligentia.co.in/top-five-reasons-to-have-mobile-apps/
5 Reasons Why Your Business Needs A Mobile App
Why DoesYour Business NeedA Mobile App: Reasons & Facts
Why Is The Market Going Mobile?
Mobile Facts and Figures
FACTSSmall Businesses Using a Smartphone: 94% Out of 4 businesses, 3 businesses on an average use business apps75% of the businesses claim saving money using mobile apps34% of the businesses admit to mobile bankingSource: AT&T and SBE Council
Websites vs. Apps: Which One Has More Weightage?
Does Your Business Mobile App Address These?5 Reasons Why Your Business Should Have A Mobile App
1. Portability and Flexibility 2. Portability and Flexibility 3. Social Media Reach4. Promotion and Exclusivity5. Business Expansion