Methods and systems for managing a pool of subscriber identities, and wirelessly provisioning mobile devices to use one or more of the subscriber identities when a subscriber is roaming on a different network. When a subscriber's mobile device connects to a visited network, a subscriber identity server can be notified. The subscriber identity server may have access to a plurality of available subscriber identities (e.g., registered to various service providers), and may select a suitable subscriber identity matching the subscriber's visited network. The subscriber identity can be communicated to the subscriber's mobile device, which can be reprogrammed to assume the new subscriber identity.