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Under what circumstances will Apple charge for SMS?

Apple mobile phone has iMessage function. If both parties turn on this function, texting is free. If not, there will be a charge.

IMessage is an instant messaging software launched by Apple, which can send short messages, videos and so on. It has high security. Different from the SMS/MMS service of operators, users only need to support data through WiFi or cellular data network to complete communication.

IMessage information is text, photos or videos sent to another iPhone, iPad, iPod touch or Mac through Wi-Fi or cellular data network. This information is usually encrypted and displayed in blue text bubbles. To turn iMessage messages on or off, go to Settings > Messages. If you don't use iMessage information, you can use SMS/MMS. These messages are texts and photos that you send to other mobile phones or other iPhone, iPads or iPod touch. SMS/MMS is unencrypted and appears in a green text bubble on the device.