You may have this issue if your phone is unable to:
These steps help identify and resolve the underlying cause. After completing each step, test to see if the issue is fixed. If not, continue to the next step.
Verify mobile data is enabled.
Update the data profile.
Do you see an error message that says the media file is too large?
Try reducing the size of the file with a compatible editing program available in Google Play Store™.
You can also try to send the file via email. Email providers usually have a higher bandwidth to handle larger files.
Perform a soft reset.
A soft reset reconnects your Virgin Mobile Lumia 635 to the Virgin Mobile network.
Note: To optimize device performance, be sure your Virgin Mobile Lumia 635 is running the most recent device software. Check for software updates.
If you're still having issues, contact Virgin Mobile Customer Care.