[WordBanter AI]

To write sideways on a Word document, you can use the Text Box feature. Here are the steps:

1. Click on the "Insert" tab on the top menu bar.
2. Click on "Text Box" in the "Text" section.
3. Choose the type of text box you want to use. You can choose a pre-designed one or create your own.
4. Click on the text box to select it.
5. Click on the "Text Box Tools" tab that appears on the top menu bar.
6. Click on the "Text Direction" button in the "Text" section.
7. Choose the direction you want the text to go. In this case, you would choose "Rotate all text 90 degrees."

Once you have done this, you can type your tear-off phone numbers in the text box and they will appear sideways on the page. You can then adjust the size and position of the text box as needed.