What's the red exclamation mark next to the text message?

A red exclamation mark will appear on the sent email, indicating that the email was not sent.

If the mobile phone can't send short messages, you can try to restart or replace the mobile phone for testing to check whether the following conditions exist:

1. SMS center number is not set correctly. Please re-enter the correct SMS center number.

2. No signal or low battery. It is recommended to recharge and try again.

3. The system is busy due to the peak of sending short messages on holidays, so it is suggested to try again later or avoid sending during peak hours.

4. The sending format is incorrect. If you send a short message to PHS users, you need to add the area code before the number.

5. The short message sending time exceeds 24 hours;

6. The mobile phone shields the short message sending function;

7. Blacklisted by SMS;

8. The number balance is insufficient. Try again after charging.

9.SMS inbox and outbox are full. Please delete some messages and try again.

If the above reasons cannot be solved, you can contact the local manual customer service or go to the business hall to confirm whether the SMS function is enabled and hand it over to the staff.

Extended data:

Common troubleshooting of mobile phones:

Symptoms: The caller ID of the mobile phone cannot access the mobile network.

1. First of all, it may be that the mobile phone really has no signal, or it may be that the mobile phone is in flight mode.

Solution: first check whether the flight mode is on, if it is off, if the cell phone signal at the current location is not good, you can make a call from another location.

2. This problem may also occur if your SIM card is not inserted correctly or has poor contact.

Solution: Pull out and reinsert the SIM card of the mobile phone. Generally, the SIM card needs to be replaced after 3 years of use, otherwise it is easy to get poor contact.

3. If the mobile phone card is in arrears, you can ask people around you to call you to see if the prompt tone has stopped.

Solution: The mobile phone stops due to arrears, and can be used normally after payment.

There is something wrong with the network system of the mobile phone.

Solution: Turn on the phone to restore the network settings and wait for the phone to restart to see if it solves the problem.