Your Apple ID is the account you use for all Apple services. To take advantage of all the good stuff in this guide, you'll need to find where this magical Custom number format option is. You can change this setting so cells formatted as numbers display the same number of decimal places. Found inside – Because a device is tied to uniquely identifying information such as a UDID and a serial number, Apple was able to direct devices to an MDM. You can also add your own custom number format into the text box. Search in the menu text box to select a format. Your organization would have an Apple Customer Number, which contains the history of all orders or purchases made. It also includes when an account was created and IP.