When someone sends you a photo, a video, or includes you in a massive group text message, your Android phone uses the MMS (Multimedia Messaging Service) protocol to receive the data. By default, your messaging app is configured to automatically download these media attachments in the background the moment they arrive.
While this makes group chats seamless, it poses a significant security risk. Historical Android exploits (such as Stagefright) have proven that a hacker can compromise a phone simply by sending a maliciously crafted video file via MMS. If the phone automatically downloads the file, the payload executes without you ever even opening the message. Furthermore, automatically downloading high-resolution videos over cellular data can quickly drain your monthly bandwidth cap.
You can force your messaging app to block automatic MMS downloads, requiring you to manually tap a button to download the media.
How to Disable Auto-Retrieve MMS (Google Messages)
You can turn off this feature directly within your default SMS application.
- Open the Messages app (the default Google SMS app) on your Android phone.
- Tap your Profile picture (or initial) in the top right corner.
- Tap on Messages settings.
- Scroll down and tap on Advanced. (If you don’t see Advanced, look for a section called “Auto-download MMS”).
- Locate the toggle switch labeled Auto-download MMS.
- Turn the toggle to the Off position.
- (Optional) If you travel frequently, also turn off Auto-download MMS when roaming.
From now on, when someone sends you a photo or a group text, you will simply see a placeholder box with a small download arrow. You can safely ignore spam messages, and explicitly choose to download media only from trusted contacts.