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What's the difference between sending a message in a flying letter and sending a message in a flying letter?

Hello, the message sent by Fetion is sent to the other party's Fetion client, and the other party needs to be online to receive the message. Sending a message by fetion is sent to the other party's mobile phone. If the other party is your mobile Fetion friend, it is free of SMS fee, but if the other party is not your mobile Fetion friend, you should receive SMS normally. Because you use Fetion client, you have to deduct GPRS traffic fee. For your reference, thank you for choosing China Mobile.