Apple's text messages have exclamation points.

There is an exclamation mark on the SMS icon of iPhone, indicating that there is an unsuccessful message to send in the SMS.

Solution:

1. First, turn on the phone and click the "Settings" system icon.

2. Then click the "information" option, as shown in the figure below.

3. Then turn on and off the "iMessage" option and restart.

But in order to clear the exclamation point in the message, we need to turn off the iPhone.

5. Then turn on the iPhone later. At this point, click the message icon again.

6. Then send the unsent message.