I am not receiving all my MMS messages. Some of the messages have a download button next to them, when I click the download button it says that the download was unsuccessful. Once in a while if they resend it, it may work--that happens hardly at all, it has happened a few times. These txts are coming from non-Sprint (Verizon & AT&T) users. Anyone have any help for me on how to fix this? I have done the update, so my phone has the current software on it. Thanks for any help!