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How does iphone6 see if the SMS was sent successfully?

Need tools: iPhone 6 mobile phone

Check whether the short message was sent successfully:

After 1.iPhone 6 is unlocked, open the application SMS under the main screen page.

2. After entering the main page of SMS program, click New SMS in the upper right corner of the screen.

3. After selecting the contact person to send SMS, edit the information and click the Send button on the right.

4. If the SMS is sent successfully, there will be no prompt below the message.

4. If the short message fails to be sent, there will be a red prompt at the lower right of the unsent message.