What does it mean that a message prompt appears after a long press on #iPhone#?

In SMS settings, find the settings for sending reports, and select Close to send reports.

The specific analysis is as follows:

Find the settings for sending reports in SMS settings, and select Close to send reports. In fact, it would be nice to have that, and sometimes I can know the delay in sending short messages.

Click on the phone in the settings, select the call forwarding function, and see if it is turned on or off.

The mobile phone may not update the mobile network settings, so when prompted to update, the mobile phone updates it.

Open a 4G mobile phone card and a 4G package. If there is no local 4G network or poor 4G data signal, there is no way out.

Because iphone can send imessage when there is a 2G/3G network, you can only send it successfully when the receiver is also in this network, otherwise it is short message service sending, that is, ordinary short message, that is, prompt function, which has no influence.