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SMS sent when iMessage is not enabled on Apple's mobile phone will be sent by default, and the SMS fee will be charged according to the operator's tariff standard. When the iMessage function is turned on, the blue sending content indicates that the message is sent in iMessage mode, and the word "Delivered" will be displayed below the message after successful sending; When the content is green, it means that the information is sent by SMS.

Tips:

1, iMessage must be sent and received under wireless local area network (or cellular mobile network connection), and the receiver has turned on iMessage, otherwise the system will send it by SMS by default;

Please call Apple's official customer service hotline for consultation.