Methods, systems, and apparatus are presented for enabling unlimited roaming service on a roaming partner switch. In one aspect, a method includes configuring a billing system corresponding to a home wireless service provider to authorize a subscriber device to receive unlimited roaming service on a roaming partner switch; receiving, by the home wireless service provider, a registration request from the roaming partner switch identifying the subscriber device; registering the subscriber device in the billing system as an unlimited roaming service subscriber device; and providing unlimited roaming service to the subscriber device. Further, a call request associated with the subscriber device can be received from the roaming partner switch and billing associated with the call request can be suspended.