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This app usually looks like a speech bubble icon. You can find it on your home screen or Apps menu. It will open a drop-down menu. This will open your message settings on a new page. It's at the bottom of the menu. It's at the bottom of the Multimedia Messages menu. It will open your options on a drop-down menu. This will prevent your SMS text messages from automatically converting to MMS. If you send pictures, audio or video in Messages, it will still convert and send as an MMS. When this option is turned off, your Galaxy will stop automatically downloading the contents of incoming MMS messages. You can still open the message in the in the Messages app, and manually download its contents.
Open the Messages app on your Galaxy. Tap the icon on the top-right. Tap Settings on the drop-down menu. Tap More settings. Tap Multimedia messages. Tap Set restrictions. Select Restricted in the drop-down. Slide the Auto retrieve switch to .