iOS 17 Tutorial: Enabling the Subject Field in Messages on iPhone

Enabling the subject field in messages on your iPhone running iOS 17 is a simple process that can help organize your text conversations. With just a few taps, you can add a subject line to your messages, making it easier for you and the recipient to keep track of the conversation topic.

You can also watch this video about how to enable the subject field in messages on an iPhone for additional info.

Step by Step Tutorial to Enable the Subject Field in Messages on iPhone

Before we dive into the steps, let’s talk about what we’re accomplishing here. By enabling the subject field, each text message you send will have a distinct subject line, similar to an email. This can be incredibly useful for separating different conversation threads or making important messages stand out.

Step 1: Open Settings

Open the Settings app on your iPhone.

The Settings app is where you control all the customizable features on your iPhone. It’s the one with the gear icon, and you can usually find it on your home screen or in the App Library.

Step 2: Scroll to Messages

Scroll down and tap on the “Messages” option.

The Messages section is where you can adjust settings for your iMessage and SMS texts. It’s a good place to explore if you want to tweak how your messages work.

Step 3: Toggle On the Subject Field

Find the “Show Subject Field” option and toggle the switch to the ON position.

The Show Subject Field option is usually towards the bottom of the Messages settings. When the toggle switch is green, that means the subject field is on.

After completing these steps, you’ll notice that when you go to send a new message, there’s a separate line above the main text box where you can type in a subject. This line will be sent along with your message, making it stand out in the recipient’s inbox.

Tips for Using the Subject Field in Messages on iPhone

  • Use the subject field to highlight the importance of a message.
  • Keep your subjects brief and to the point.
  • Use subjects to categorize messages for easier searching later.
  • The subject field can be used in both iMessage and SMS texts.
  • Remember that not all phones will display subject lines, so use them strategically.

Frequently Asked Questions

How do I know if the subject field is enabled?

If you see a separate line above the text box when sending a message, then the subject field is enabled.

Usually, when you go to type a new message, you only see one large text box. With the subject field enabled, you’ll see a smaller text box above it with “Subject” written inside it.

Will the subject field show up for all recipients?

It depends on the recipient’s phone and messaging app.

Some phones and messaging apps don’t support subject fields. In that case, the subject might show up as part of the message text or not at all.

Can I add a subject to messages I’ve already sent?

No, you can only add a subject before sending a message.

Think of the subject field like an envelope for a letter. Once the letter is sent, you can’t change the envelope.

Does enabling the subject field cost anything?

No, it’s a free feature included with iOS 17.

Apple doesn’t charge for features within the operating system, so you can use the subject field as much as you want without worrying about extra charges.

Can I turn off the subject field after enabling it?

Yes, you can toggle it off at any time in the Messages settings.

If you decide you don’t want to use the subject field anymore, just follow the steps above and toggle the switch to the OFF position.


  1. Open Settings
  2. Scroll to Messages
  3. Toggle On the Subject Field


In conclusion, enabling the subject field in messages on your iPhone is a quick and easy way to add clarity and organization to your text conversations. Whether you’re coordinating plans, discussing multiple topics, or just want to make your messages stand out, the subject field is a nifty feature to take advantage of. With iOS 17, Apple continues to enhance the messaging experience, and this small yet impactful addition is a testament to that. So, give it a go, and see how it transforms your texting game. Remember, the key to clear communication is not just what you say, but also how you present it.