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What's the difference between the color of short messages, blue and green?

The difference between the short message color blue and green is as follows:

1, sending method: In iOS system, blue means sending via iMessage, and green means sending via traditional SMS. In Android system, blue means sending via network, and green means sending via mobile phone card.

2. Fees: blue (iMessage mode) usually uses traffic, while green (traditional SMS mode) charges according to the number of SMS messages.

3. Reception conditions: The reception of blue short messages requires both parties to connect to the Internet and open iMessage service, while the reception of green short messages does not require these conditions.