If you’re seeing a “Subject” field appear every time you compose a text message on your iPhone, you might be wondering how to remove it. The subject line feature is rarely used and can make your messages look like emails rather than normal SMS texts. Many users enable it accidentally, especially after adjusting accessibility or message settings.
This guide explains how to turn off the Subject Line in iPhone Messages, why it appears, and what to do if the option doesn’t disappear.
What Is the Subject Line in iPhone Messages?
Apple includes a feature in the Messages app that adds a subject field above the normal message text box. When turned on:
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Your SMS/iMessage shows a bold subject and a normal message below it.
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It splits your message into two parts.
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Some carriers count it as two messages when sending SMS.
Most users don’t need this feature, which is why turning it off is a good idea.
How to Take Off Subject on iPhone (Step-by-Step Guide)
Turning off the subject field takes only a few seconds. Here’s how to do it:
1. Open the Settings App
Start from your iPhone’s home screen and tap Settings.
2. Scroll Down and Tap “Messages”
This section controls all messaging features such as iMessage, SMS/MMS, and message formatting.
3. Find the “Show Subject Field” Option
Scroll until you see the SMS/MMS section.
You’ll find a toggle labeled:
➡️ Show Subject Field
4. Turn Off the Toggle
Simply switch the button to the Off position.
Once turned off:
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The subject line disappears from your message composer.
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Your messages return to the standard single-text-field layout.
That’s it — you’ve removed the subject line on your iPhone.
What to Do If the Subject Field Still Appears
In rare cases, the subject field may continue to show. Here are quick fixes:
1. Force Close and Reopen Messages App
Swipe up (or use the Home button) → Remove Messages from recent apps → Reopen it.
2. Restart Your iPhone
A simple reboot often refreshes UI elements.
3. Check for Software Updates
Sometimes older iOS versions glitch.
Go to:
Settings → General → Software Update
4. Reset All Settings (Last Resort)
This will NOT delete your data, only settings.
Go to:
Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings
Why You Should Take Off the Subject Line
Disabling the subject field has several benefits:
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Sends cleaner, normal-looking messages
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Prevents accidental two-part SMS charges
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Avoids confusion with email-style formatting
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Simplifies the message box layout
How to Turn On the Subject Field Again (If Needed)
If you want to use it later:
Settings → Messages → Show Subject Field → Turn On
Frequently Asked Questions
1. Why does my text message show a bold line on top?
That bold line is the Subject. You can turn it off in:
Settings → Messages → Show Subject Field → Off.
2. Does the subject field cost extra?
For SMS, some mobile carriers may count subject + message as two texts. For iMessage, there is no charge.
3. Can I remove the subject field for only one contact?
No. It is a system-wide setting that affects all conversations.
Conclusion
Removing the subject field on your iPhone is simple and takes only a few seconds. By turning off the Show Subject Field option, your Messages app returns to its normal one-text-box layout, making your conversations cleaner and easier to manage.