Sending or Receiving MMS
- Is your mobile data turned off? Do you see "unable to connect to MMS server"?
Check your phone's settings and make sure Cellular data or Mobile data is on. MMS requires a connection to your mobile plan unless you are using your provider specific app that allows you to connect over WiFi.
- Do you have a firewall?
For example: No-Root Firewall If you do, then you may need to disable it to download MMS. MMS requires a connection to your mobile plan.
- Are you over the MMS size limit?
Signal has an MMS file size limit of 300kb. Providers have a limit to MMS size, so Signal's limit is within those of providers.
- See the bullet points in Sending or Receiving MMS above
- Have you restarted your phone?
For some devices, if you restart your phone then re-download the MMS, it will succeed.
- Do you have another app that can read MMS? i.e. Textra
Even if the other app is not open, it can retrieve the MMS before Signal can. Check your other app.
- Are media download settings set to use mobile data?
Go to Signal > Menu or > Settings > Chats and media > Tap on "When using mobile data" and enable your choice of images, audio, video, documents.
- Configure APN Settings
Android phone Settings > Under Wireless & networks choose "more" or on some devices go to the option where it says Mobile Networks > Choose Access Point Names > Select New APN and Enter the APN Settings required for your carrier
- Ask your provider to reprovision your device
Call your mobile provider to have them refresh your APN settings and/or reprovision your device.
- Delete all APNs & have your mobile provider reset it
Delete all listed APNs, restart your phone, then have your mobile provider reset your APN settings.
- Place phone in airplane mode and delete the offending message
Place your phone in Airplane mode, then Open Signal. Find your message you just received, long-press to highlight the MMS message and tap the trash can to delete. Then take your phone out of airplane mode.
- Receive a new message and mark all as read
After receiving a new message, use the notification or quick reply functionality to mark all messages as read
- Are you using Tmobile?
Is MMS only working on mobile data? Then enable "WiFi calling" on your phone AND through Signal's Settings > SMS and MMS > enable WiFi calling compatibility mode
Phone specific guides
- HTC One: https://devicehelp.optus.com.au/web/htc-one-m8/messaging/mms/setting-up-my-mobile-phone-for-mms/
If you still have an issue please submit a debug log.