Abstract: The techniques disclosed here enable a mobile station device having a plurality of subscriber identities to select an identity for registration with a network for wireless communications in a way that takes advantage of the most favorable roaming agreements between operators. The identity selection algorithm, for example, provides the flexibility to select amongst mobile station subscriber identities of 3GPP2 (1×RTT, EVDO) access technologies and 3GPP (LTE/GSM/UMTS) access technologies as well as specific operators' networks for domestic and international roaming. The exemplary algorithms allow the operator to optimize roaming agreements in different markets and maximize revenue from the roaming of its customers.