An SD switch box embedded within a cellular handset, including circuitry for switching access to NAND storage that is embedded within the cellular handset, between a consumer electronic device that is external to and connected to the cellular handset, and between a base band modem that is embedded within the cellular handset, so as to enable shared use of the NAND memory by the consumer electronic device and by the base band modem, thereby enabling the cellular handset to be operational for cellular communication via its internal base band modem while its internal NAND memory is accessible to the external consumer electronics device.