MaxMind's Telephone Number Identification (TNI) service is a tool used to identify the type of the telephone number your customers are providing. The TNI service is able to categorize customer inputted phone numbers into 13 different phone types such as fixed land line, mobile, VoIP, and invalid phone numbers.
Knowing the phone type of the customer inputted number can be a helpful tool in thwarting online fraudulent purchases because purchases from some phone types are more likely to be fraudulent. For example, fraudsters from abroad can obtain US-based Voice over IP numbers like Skype which are untraceable and disposable.
The TNI service costs $0.06 per query.