How does iPhone save SMS to SIM card?

The specific operation steps are as follows:

1. Click the icon to find the message on the desktop of the mobile phone screen, as shown in the following figure:

2. Then enter the SMS page and find the message content to be selected according to the sender. As shown in the figure.

3. After opening the message, press and hold the one that needs to be saved for a few seconds, and then click the more menu below.

4. Select the "Save to SIM card" command in the pop-up menu.

Extended data:

Information about iMessage and SMS/MMS

IMessage information is text, photos or videos sent to another iPhone, iPad, iPod touch or Mac through Wi-Fi or cellular data network. This information is usually encrypted and displayed in blue text bubbles. To turn iMessage messages on or off, go to Settings > Messages.

If you don't use iMessage information, you can use SMS/MMS. These messages are texts and photos sent to other mobile phones or other iPhone, iPads or iPod touch. SMS/MMS is unencrypted and appears in a green text bubble on the device.