What's the exclamation point on the SMS label?

There is an exclamation mark on the SMS icon. The specific reasons and solutions are as follows:

1. The network signal difference will cause the short message to display an exclamation point. You can restart your phone and switch the network environment, and then try sending it again.

2. The other party will add you to the blacklist, which will cause the SMS to display an exclamation point. You need to contact the other party to cancel or change the mobile phone number before sending.

3. The mobile phone number is limited by the operator, which will cause the SMS to display an exclamation point. You need to contact the operator's customer service to inquire and lift the restrictions.