Why does Apple's mobile phone information have a red exclamation point?

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 sending time of SMS is more than 24 hours.

Zazie Hoko

Disadvantages of SMS:

Small information capacity

Short message platform is relatively boring because it can only edit text and lacks corresponding picture materials, and short message advertisements are rampant, so the reading rate is not necessarily too high.

Terminal data is difficult to collect.

The SMS platform needs corresponding numbers to send, so how to collect these numbers and how to send them to those customers after collection has become a very important problem.