Abstract: A method of operating an internet-based telephony system comprises (1) determining that a telephony device associated with a customer of the internet-based telephony system has access to service of the internet-based telephony system; (2) sending a first location update signal to a public land mobile network associated with the customer; (3) receiving an indication that the public land mobile network associated with the customer no longer considers the internet-based telephony system as being the network visited by the telephony device associated with the customer; (4) determining the telephony device associated with the customer and the internet-based telephony system are in data communication, and (5) sending a second location update signal to the public land mobile network associated with the customer to register again the internet-based telephony system as the network visited by the telephony device associated with the customer.

Abstract: A method of operating an internet-based telephony system (20) comprises determining that a telephony device (30) associated with a customer has access to service to the internet-based telephony system (20); and sending a location update signal to a public land mobile network (32) associated with the customer. The location update signal is configured to include an identification of the internet-based telephony system (20) as a network visited by the telephony device (30) associated with the customer.

Abstract: Systems and methods for terminating telephony communications to a mobile telephony device associated with a first native telephone number are disclosed. The method comprises: receiving, from a native mobile telephony provider network associated with the first native telephone number, a telephony communication that was originally directed to the first native telephone number but which has been forwarded to a forwarding access number, where the telephony communication includes a header comprising the first native telephone number; retrieving the native telephone number from the header; mapping the native telephone number to a mobile telephony device of a subscriber; and terminating the received telephony communication to the mobile telephony device associated with the native telephone number.

Abstract: Methods and systems for detecting a change in contact information are provided herein. In some embodiments, a method for detecting a change in contact information may include sending a request including a communication identifier stored in an address book associated with a first user, receiving, responsive to the request, a first identifier associated with the communication identifier, and comparing the first identifier received with a second identifier stored in association with the communication identifier.

Abstract: A method of operating an internet-based telephony system (20) comprises determining that a telephony device (30) associated with a customer has access to service to the internet-based telephony system (20); and sending a location update signal to a public land mobile network (32) associated with the customer. The location update signal is configured to include an identification of the internet-based telephony system (20) as a network visited by the telephony device (30) associated with the customer.

Abstract: A method of operating an internet-based telephony system comprises (1) determining that a telephony device associated with a customer of the internet-based telephony system has access to service of the internet-based telephony system; (2) sending a first location update signal to a public land mobile network associated with the customer; (3) receiving an indication that the public land mobile network associated with the customer no longer considers the internet-based telephony system as being the network visited by the telephony device associated with the customer; (4) determining the telephony device associated with the customer and the internet-based telephony system are in data communication, and (5) sending a second location update signal to the public land mobile network associated with the customer to register again the internet-based telephony system as the network visited by the telephony device associated with the customer.