Only Leaf Wireless will be able to help you I think, they have all the settings for HTC so maybe its the same with Imate. They do all the MMS, internet and Email settings.
This is what u do -
goto http://www.leaf.co.za/Support/
click on imate-faq's
goto downloads
click on k-jam network settings
download the vodacom settings
it will download it as a cab file - just transfer it to u're phone and run the file - then voila - it should work - hope it helps - thats what i usually do when i switch sim cards or format my imate-jam