Galaxy S6, had it for a month or so. Was working fine until maybe the last week, when I noticed that I cannot download and MMS messages over the Verizon network. If I connect to WiFi, I receive the message right away. I am using the Message+ app on the phone (Verizon app), but have also tried a 3rd party messaging app and confirmed I still cannot download the messages unless connecting first to WiFi. Data is enabled (4GLTE connection currently), I can connect to the internet or use any other apps that require a data connection. I get a 'Download' button in the conversation that when clicked it appears to try to download, but with no result. I get a message that says "Network not available. Will try again later or over WiFi If integrated messaging is available" (I think I got that all down right, the message does not stay up long). No idea why the network is only unavailable for these messages.