It could be a connectivity problem. I had the same issue. I called Sprint customer service line for help. They tried to reset my phone with out doing a "hard reset" but no luck. Eventually they decided they would send me a new phone. But I still wasn't ready to give up on my phone (I had so much info on my phone I didnt want to lose it). So I started looking my message settings again. I noticed that in the "Connection settings" all of the fields (Name,MMSC, MMS proxy, MMS port, MMS protocol) were empty. Of course, I didn't know what should go in each field, so out I frustration I decided to HARD RESET my phone(losing most of my info). After that, all the fields was filled and I was able to receive and send pictures messages. Just in case it happens again, I wrote down all the information in each field so I can enter everything manually.
I had the same problem: Unable to download message - Service Denied, I had my Sprint Hot Spot turned on at the time. So I turned off the Sprint Hot Spot and everything was fine, downloaded OK.
LMCELVANY-Are any of you using the WIFI connection on your device? If so, you need to make sure you disable WIFI and connect using either the 3G or 4G connection.
Having trouble posting or viewing your Private Messages? We made an update to the Community registration process which requires you to validate your email, click here to read more about it.