If MMS is not working on Android, the most common cause is that mobile data is turned off, because MMS requires a cellular data connection and will not work over Wi-Fi alone. The next most likely culprits are incorrect APN settings, a misconfigured messaging app, or a corrupted app cache, all of which you can fix yourself in a few minutes.
Why your MMS is not working on Android: The one requirement most users miss
The single most overlooked requirement for MMS on Android is that mobile data must be enabled. Unlike SMS, which travels over the cellular control channel, MMS uses your phone's data connection to download and upload picture messages. If you are connected to Wi-Fi, your phone may still fail to send or receive MMS because the carrier routes MMS over the mobile data network, not your home internet. Beyond that, the other common causes, in order of likelihood, are incorrect Access Point Name (APN) settings, a glitched messaging app cache, and a third-party SMS app that has hijacked MMS handling.
Turn on mobile data and check your connection
MMS depends on a working mobile connection, so your first step is to verify that mobile data is actually on and that you have a usable signal. Google's Android help pages direct users to Settings > Network & internet for cellular and network checks. Open that menu and confirm that mobile data is toggled on. If it is already on, check the signal strength indicator in your status bar; if you are in a low-coverage area, move closer to a window or step outside to see if the signal improves. A simple restart of your device can also refresh a stale connection.
Reset your APN settings to default
Incorrect Access Point Names are the most common configuration problem that breaks MMS. Your APN settings define how your phone connects to your carrier's data network, and if they are wrong, MMS will fail even when mobile data is on. To fix this, open your device's settings app and reset your APN settings to default, as Google's help pages recommend. Google's pages say APN settings may need to be reset, which implies carrier-specific configuration can matter. If the carrier's MMS settings differ, Google's pages direct users to use the carrier/device APN defaults rather than manual values. Do not guess at manual values; the carrier-specific configuration is already stored on your device. Go to Settings > Network & internet > Mobile network > Access Point Names, tap the menu (usually three dots), and choose "Reset to default." If that option is not visible, contact your carrier for the correct APN values, but the default reset resolves most issues.
Check Google Messages settings for MMS
If your network and APN settings are correct, the problem may be inside the Google Messages app itself. Open Messages, tap your Profile picture or Initials, then go to Messages settings > Advanced > Group messaging. In that menu, you must select Send an MMS reply to all recipients (group MMS) so that group conversations send as MMS rather than individual SMS texts. Google's help pages say to use the app's Advanced and Group messaging options for MMS behavior. Google's help content also says to make sure MMS mass text is turned off, as this feature can split a group message into separate SMS messages instead of a single MMS.
Switch an undelivered message to text (SMS/MMS)
When an MMS fails to send automatically, Google Messages has a built-in fix that forces a resend. Google Messages offers Switch to text (SMS/MMS) from the message's timestamp menu. Tap the timestamp next to the failed message, and from the menu that appears, select Switch to text (SMS/MMS). This tells the app to stop trying to send the message as a data-heavy MMS and instead send it as a standard text message, which often goes through when the MMS path is blocked. This is a quick workaround for a single stuck message, but if it happens repeatedly, the underlying cause is likely one of the settings issues above.
Clear cache and data of your messaging app
A corrupted cache can block MMS even when all settings are correct. To fix this, go to Settings > Apps (or Apps & notifications), find your messaging app (usually named Messages or Messaging), and tap on it. First, try clearing the cache only; this removes temporary files without affecting your conversations. If the problem persists, clear the data as well, but be aware that clearing data removes your message history and resets the app to its default state. Back up any important conversations before you do this. After clearing, restart your device and test MMS again.
Set the correct default SMS app
Third-party apps can hijack MMS handling, so if you have installed another texting app, it may be intercepting your messages and breaking MMS. If another app is handling texting, change the default messaging app to resolve MMS issues. To check which app is in charge, Google's community guidance says to go to Settings > Apps & notifications > Advanced > Default apps > SMS app and change the default messaging app. If it is not Google Messages, switch it back. Google Messages is recommended because it is the default Android messaging app and is designed to handle MMS correctly with your carrier's settings. If you prefer a third-party app, ensure it is updated and check its own MMS settings, but switching to the default app is the most reliable fix.
Still not working? Carrier-specific checks
If you have completed all the device-side steps and MMS still fails, the issue may be on your carrier's side. Contact your carrier to check for account-level MMS blocks, which can happen if MMS is disabled on your plan or if you have exceeded a data limit. Carriers also impose size limits on MMS attachments; if you are trying to send a very large photo or video, it may be rejected. Finally, there may be a network outage in your area that no device setting can fix. Your carrier can confirm whether MMS is working on their network and whether your account has any restrictions. When you call, mention that you have already reset APN settings and checked the Messages app, so they can skip basic troubleshooting.
Frequently Asked Questions
Why does MMS only work when I turn on mobile data?
MMS is transmitted over your carrier's data network, not over Wi-Fi or the SMS control channel. Without mobile data enabled, your phone has no data path to download or upload the picture message, so it fails even if you have a strong Wi-Fi connection.
Can I send MMS over Wi-Fi?
Some carriers support Wi-Fi calling and messaging, but MMS generally requires a mobile data connection. If your carrier offers Wi-Fi MMS, it will work only when your phone is configured to route MMS through Wi-Fi, which is not the default on most Android devices.
Why can I receive MMS but not send them?
This usually points to a size limit on outgoing attachments or an account-level restriction. Check the file size of what you are sending, and contact your carrier to confirm that outgoing MMS is enabled on your plan.
Will clearing the Messages app data delete my photos?
Clearing data removes your message history, including the text and attachments stored within the app. Photos saved to your device's gallery are not affected, but any image that exists only inside a conversation will be lost.
Do I need to reset APN settings after a system update?
System updates can occasionally overwrite or corrupt APN settings. If MMS stops working after an update, resetting APN settings to default is a quick fix that restores the carrier-specific configuration your phone needs.
For the wider topic, see social, messaging and account apps.
