The shortcut app comes preloaded on the iPhone and can be used to set quick automation; You can set shortcuts that can execute several options at the same time. For example, you can connect to your homepod and play your smart lights at one time, to play instrumental music while demolishing with a tap. If you are new to the shortcut app, start here with seven recommended automation.
Strange, Apple never offered a shortcut action to open an IMESSAGE thread. In iOS 18.4, however, Apple is fixing that mistake. And because the shortcut is so well integrated into the whole iOS software, then you can add this shortcut to a lock screen, control center and even the action button.
How to make IMessage Shortcut

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Open the shortcut app, and tap Plus Button on top to create a new shortcut. Again, in Search activities Bar, search open communicationAnd add action.

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Tap empty “Conversation“Select the IMESSAGE conversation used for the field, and shortcuts. (This can be a group message thread or an SMS conversation.)

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And there you have it. I would advise you to tap the name shortcut to the top, and change its name that you will remember.
How to add message shortcut to home and lock screen
You can add your message shortcut to the shortcut app on the home screen itself. Tap up the shortcut name, and “choose”Add to Home Screen“Options. Here, you can give a name to the shortcut, and adapt the icon with an image.
To add it to the lock screen, first tap and hold the lock screen. Then, tap to conditionChoose more lock screen,

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Now you will see two buttons below. First, tap Loan Button on a quick access button that you want to remove, then tap Plus Button in empty space.

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Here, search and “choose”Shortcut“Option. Next, tap choose The button, and select the shortcut we created. Tap DoneTo save the lock screen layout.
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How to add a message shortcut to control the center
To add the shortcut to the control center, open the control center, press and hold to enter the editing mode, and tap Add a control button. Next, find and add Shortcut Control.

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In adaptation screen, tap chooseAnd select the shortcut you have just created. Go back to the control center and feel free to move the control as per your wish.
How to add a message shortcut to the action button
If you are using the iPhone 15 Pro series or higher, you have access to the action button. You can use it to launch a camera or any shortcut quickly that you want.
To install it, go on setting , Action button And slide on Shortcut Option. Tap again Choose a shortcutAnd choose a shortcut made now.

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Now, when you press and hold Action The button, it will immediately open the IMESSAGE conversation of its choice.