Abstract: Various embodiments are described herein that relate to computer hardware and programs for facilitating international calls between individuals. More specifically, an international call system can route voice traffic between multiple telephone network endpoints. For example, a client application (also referred to as a “client”) may be accessed by a traveler on a mobile phone. The client can be configured to connect to a network-accessible application server, which can communicate with a call processing system that routes voice traffic from the traveler's mobile phone to the mobile phone of a desired contact (and, in some embodiments, vice versa). The international call system described herein makes use of the local providers in each country traversed by the traveler. Consequently, low-cost calling can be enabled in both directions, while predictable reachability is guaranteed as the traveler moves between different local providers.