What does the iPhone 7 US version card sticker mean?

The American version of the card attachment machine refers to iPhone devices that use mobile phone cards, that is, foreign locked iPhones. This lock refers to a network lock, which is a contract machine. After affixing the card sticker, the phone can make and receive calls using cards other than SIM cards specified by the operator.

The card-mounting machine means an Apple mobile phone with a network lock. Apple mobile phones are locked to the operator's network, that is, contracted phones. If the operator's card is not used, it will show that there is no service and cannot make calls, send text messages, surf the Internet, etc. The card application machine generally refers to the American version. In China, you cannot use it if you do not perform certain technical processing.

The card sticker is an unlocking tool used when the mobile phone cannot be unlocked with software. Allow your mobile phone to make and receive calls using cards other than the SIM card specified by the operator.