How to back up iphone6s plus SMS?

The mobile phone 6s plus SMS backup is operated according to the following steps:

Download iTunes software on the computer, go to Apple official website to download the latest version of iTunes, and download and install it directly through Baidu.

Next, connect the iPhone 6s plus to your computer, and then open the iTunes software.

At this time, unlock the iPhone and allow the computer to access the phone data.

Next, in the iTunes window, when the connected iPhone is recognized, an iPhone device icon will appear, and then click Continue.

Then you will enter the summary management interface of iPhone, and click the Backup Now button in the iTunes window to continue.

Then follow the prompts to start backing up the SMS on the iPhone.