A facility for maintaining a subscriber history pertaining to the use of a mobile device with an IP-based telecommunications service offered by a service provider. When a connection request is made by a mobile device to access an IP-based telecommunications service, one or more identifiers associated with the requesting mobile device and access point are provided in the request and stored by the facility. In some cases, the identifiers are stored even if the mobile device is unable to, or not authorized to, access the telecommunications service. Additional parameters associated with the request from the mobile device, such as a time stamp and details of a subsequent telecommunications session, are also associated with the stored request. The history of requests to access the IP-based telecommunications service from the mobile device are maintained by the facility and provided to a service support provider.