My iPhone6 suddenly can't send text messages in the morning and can't accept any text messages. I've tried all those methods on the internet and returned them.

1. Because the system will use wireless network or mobile network to send iMessage messages, if the current iPhone is not connected to the wireless network or the mobile network signal is not good, the problem of information transmission failure will occur.

2. When the message has not been delivered, if the current network signal is not good, you can click the red message icon.

3. If you can't send iMessage information through the network at present, please press and hold the content of the short message you want to send, and then select the option of sending by SMS.

4. For users who have turned on iMessage, it is best to turn it on as a short message sending option in Settings-Information. In this way, when the network is not smooth, or when there is no network, it will be automatically sent by traditional SMS.

5. If it is confirmed that there is no problem with the mobile signal of the current mobile phone and the call is normal, then you can try to restart the iPhone at this time. You can turn off your phone by holding down the power button, then sliding, turning it off and turning it on again.

6. If you still can't send SMS after restarting, you can also try to restore the network settings of iPhone at this time. In the Settings-General-Restore list, it can be solved by restoring the network settings.

7. If it still doesn't work after restoring the network settings, it is recommended to call the operator's customer service and ask them to check the data in the background of the mobile phone to see if there is any problem.