What does single card mean?

Apple 12 external single card refers to the production abroad, and only one SIM card can be installed on the mobile phone. The American version is a single card with and without locks, which is also commonly known as parallel imports. It's not the phone of the Bank of China. Trouble after sale, only one operator card can be inserted. Only Bank of China is dual-card. Lock-free means that this mobile phone has no carrier card, which means that no matter what card you use, whether it is Unicom or mobile, it can be used in any country.

Definition of Apple 12 Single Card

12 single card is a mini version, and other versions are dual-card dual-standby dual-card mobile phones. Dual-card dual-standby mobile phone can insert two mobile phone cards at the same time, choose the main card as the main card for voice or data, and the other card as the auxiliary card. Two cards can receive voice calls and short messages at the same time, and the main card can be used as data to surf the Internet. At the same time, in the case of using the main card, you can choose to use the secondary card to surf the Internet.

The IPhoneXr released by Apple Mobile Phone Company in Chinese mainland is a dual-card dual-standby model, but it is divided into full netcom version and full netcom customized version, and mobile 4G priority version. The single-card version of iPhoneXr, which is more common in China, is generally a special version of the US version and a Korean version, and because the US version is generally a contract machine in the United States, it has an advantage in price, so it is more popular.