Many business owners work hard on their business all day and do the books at night. If you are reviewing your accounts at 9:30 at night you can’t ring customers to ask where their payment is. Most high end phones now can access the Internet and allow you to easily see if money has been received and get the phone numbers of people you are chasing allowing you to contact them between jobs.
Set aside some time in your normal working day to make a few phone calls to chase down bad payers.
Here is a demonstration of what you can do on your mobile device.