I've found a problem for local business owners. Maybe you're selling AC repair service ( or any other service ). Now you want to create an android and IOS App which will approve on play & App Store.
Why?
Because of, if customer install your app on her phone, it will be so much easy to find you. If he need any service, he will open the app, and make a request. And her/him request on your door.
As a result, you'll get new requests for your service. Which will increase your revenue.