SAP (SIM Access Profile) - definition
SAP is a profile which is provided by BlueTooth connectivity. By using this technology SIM card profile or signal can be used in another device which doesn’t have SIM options such as car or any automotive. Usually, cars have GSM mobile antenna installed over the chassis. If the SIM profile can be shared suing SAP over BlueTooh then user can use the GSM network on the car too even though there is physical SIM unit.