Show Subject Field on iPhone: How to Add or Remove a Subject Line in Messages

* This post is part of iPhone Life's Tip of the Day newsletter. . *

There’s a setting called Show Subject Field on on iPhone that a lot of people are scratching their head over. Simply put, this setting allows you to add or remove the subject line in iMessages and text messages in general. Whether you’ve never used this feature but would like to add a subject line to your text messages or you have this feature and want to get rid of the subject line—we’ll cover both here. Here’s what the Show Subject Field setting means on iPhone and how to add or remove a subject line in Messages.

Related: How to Disable iMessage on iPhone

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Table of Contents:

What Does Show Subject Field Mean on iPhone?

How to Add a Subject Line to Text Messages

How to Get Rid of the Subject Line in Messages

What Does Show Subject Field Mean on iPhone?

Show Subject Field is a setting in the Messages section of the Settings app. It literally means show the subject field in Messages. When on, you’ll see a subject line above iMessage when you go to send a text. The picture below shows what it looks like in Messages when Show Subject Field is turned on. When you send a text with a subject, it appears bolded and acts as a kind of title for the body of the text message.

How to Add a Subject Line to Text Messages

Adding a subject line to text messages is super easy to do:

  • Open the Settings app on iPhone.

  • Tap Messages.

  • Find Show Subject Field, toggle on.

  • That’s it! Navigate back to the Messages app to see the changes.

How to Get Rid of the Subject Line in Messages

Conversely, you may never use the subject line and decide it’s an unnecessary feature. You can always leave the subject line blank if you sometimes do use the subject field and sometimes don’t. But if you want to turn it off altogether:

  • Open the Settings app.

  • Tap Messages.

  • Find Show Subject Field, toggle off.

  • Navigate back to the Messages app to see the changes.

Top image credit: Dean Drobot/Shutterstock.com

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Sarah Kingsbury's picture

Sarah Kingsbury is the Senior Web Editor and SEO Content Manager at iPhone Life. She manages the web editorial team and oversees all web and newsletter content. A long-time Apple enthusiast, Sarah can't live without her iPhone, Macbook Air, HomePod, Apple TV, or Apple Watch. As the original contributor to the iPhone Life Tip of the Day Newsletter, she wrote hundreds of iPhone how-tos to help users master their iPhones. It's safe to say that she has written or edited every tip published on iPhoneLife.com! Since 2013 she has co-hosted the iPhone Life Podcast, written an iPhone advice column and countless gear reviews and feature articles for iPhone Life magazine, and provided one-on-one iPhone-related assistance for our premium subscribers. In her 20 years of editing and writing, Sarah has done everything from working as the associate editor of the Iowa Source magazine to developing recipes and reviewing cookbooks for a vegetarian cooking website. But teaching people how to use their Apple devices is her favorite job so far. In her free time, she loves walking her dogs, painting, baking bread, and catching Pokémon. Sarah holds a BA in French from Minnesota State University, Mankato.