An EID (Embedded Identity Document) number is a unique identifier assigned to an eSIM, a SIM card embedded in a device, such as a smartphone or tablet. It is a 32-digit serial number that is integrated into smartphones that are designed to support eSIM chips. The EID number is unique for each eSIM and is assigned by the manufacturer. It is used to manage eSIM profile downloads and activation, and it confirms that a device is authorized to access a particular network or service. Operators use the EID number to identify the eSIM, so they can remotely provision and manage the profiles on the device.

You can find the EID number on your devices box, or within your devices settings. The location of the EID number may vary depending on the device model and operating system. For example, on an iPhone, you can find the EID number by accessing the Settings app, scrolling down to find "About Phone," and selecting it. Alternatively, you can dial the code *#06# on your iPhone keypad to display the EID directly on the screen. On an Android device, you can find the EID number by accessing the mobile/cellular settings app and scrolling down to find "About".