Mms issues with BlackBerry Curve 8530

I have 300 contacts for my message list, i have broken them down into groups of 10 but some people are still not getting my messages??? I have a blackberry curve and i have a few questions

can i send to more than 10 contacts at once
can i send to more than 1 group at once
is there an app i can buy to help me send more mms messages at once

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this is with your blackberry curve or an audiovox phone?

My blackberry phone w/boost service (not sure if that matters)