Called and left no message. A Non-Fixed VOIP service not associated with an address and could be obtained by individuals that are outside the country. Common Non-Fixed VOIP providers include Google Voice and Skype. Fraudsters can take advantage of the ease of registration with Non-Fixed VOIP services to perform elaborate schemes and criminal activity that are untraceable. Identifying suspect phone numbers early that belong to Non-Fixed VOIP providers is an important first step in fraud prevention and protection.