Now then all,
This is how I managed to fix the problem, dunno if it will work for you guys though:
-Scroll through to file manager, and once in click menu and option 8 to see your phone memory info. You'll need 4 MB free in your storage memory to download MMS.
-To free up as much memory as possible, you'll have to empty your SMS and MMS deleted items folders(remember the phone always stores items you delete in this folder); and then sent items, drafts and inboxes if necessary.
-You can also empty your internet explorer cache (mine added up to about 3 mb), by scrolling down to windows, then profiles in your file manager; and then emptying your cookies and temporary internet folders.
Hope this helps.