How to underline Apple's mobile phone?

Turn on the phone and find the icon of 123. Click more to find the underline.

1, open the text mode first;

2. Click the icon of the number 123;

3. More points;

So you can underline it.

The function of underline:

Emphasize words and attract attention. In some documents (such as WORD), underlining is usually used to enhance attention. On the other hand, in web pages, the text that can be connected (hyperlinks) is generally underlined.

Underlines are generally divided into single underline, double underline, bold underline, underlined dotted line and so on.