Abstract: A method of customizing a wireless device to a predetermined configuration is described. A wireless device configured with at least one carrier-specific parameter for a first carrier is modified to access at least one carrier-specific parameter for a second carrier during operation of the wireless device and responsive to a predetermined network switch input received by the wireless device. A carrier customization module system for a wireless device includes a carrier customization module loader executed by the wireless device which is configured with at least one carrier-specific parameter for a first carrier. The loader selects at least one carrier-specific parameter for a second carrier from among one or more carrier-specific parameters during operation of the wireless device and responsive to a predetermined network switch input received by the wireless device. The loader modifies the wireless device to access the second carrier using the selected carrier-specific parameter for the second carrier.