An additional problem found: 03mmsproxy (the one attached) sets up a route for just one of the IPs of the MMSC. If it is a balanced server it can happen that 03mmsproxy sets up a route for an IP that is different to the one that ubuntu-upload-manager uses in the end, due to different responses from the DNS servers.
The "HTTP/1.0 302 Found" server response happens even when the connection is properly routed through the cellular connection. ** Attachment added: "03mmsproxy" https://bugs.launchpad.net/ubuntu/+source/ofono/+bug/1360403/+attachment/4415199/+files/03mmsproxy -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1360403 Title: MMS does not work with T-Mobile US To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1360403/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs