Most of the best phone sex services are a managed network of dispatchers (live or automated) and erotic performers who process payment information, verify the legal age of their clients, and perform calls in their own homes on their own telephone lines. Many phone sex operators use service bureaus and phone sex directories to advertise their services. The vast majority of modern services use toll-free numbers whereby clients can dial up to request a call with a particular performer using credit cards, Automated Clearing House systems, and a variety of other billing methods. There are still some services that rely upon premium-rate telephone numbers (e.g. 976 and 900 numbers) for billing purposes, although this practice has been largely abandoned due to the high rate of fraud associated with these lines and the inability to dial 900 and 976 lines from cellular phones. As a direct result, most telephone companies allow their customers to block outgoing calls to premium-rate telephone numbers. In 1996, the FCC changed regulations on 900 numbers to address abuse of these services by minors and fraud concerns.
