Does the subject want to ask "where is the serial number gg of Apple"? Shanghai. Apple's serial number gg stands for delivery from Shanghai, and the serial number of iPhone will be arranged according to the production batch, sales location and mobile phone model. Mobile phone serial number, also called "serial number", is the common name of International Mobile Equipment Identification (IMEI). After assembly, each mobile phone will be given a unique group number in the world, which will be recorded by the manufacturer from production to factory.