How to eliminate an exclamation point in Apple SMS?

Apple SMS has an exclamation point. The reasons and solutions are as follows:

1. Network failure: If an individual is in an area with poor signal when using Apple's mobile phone, it will lead to signal failure, which will make it impossible to send SMS successfully, so a red exclamation mark will appear, and you can find a place with good network environment to resend SMS.

2. The phone bill is in arrears: when the personal mobile phone is in arrears or turned off, you can't send text messages or make phone calls. You need to pay the phone bill first to ensure that the mobile phone has a balance before you can successfully send text messages.