When you say Mobile Broadband you mean the plan for tethering your Storm to your laptop for internet, right? If so, all you need to do is call customer service to have it removed. There is no fee to do this.
If however, you are talking about the data plan that allows you unlimited email & web directly on your device, then unfortunately you cannot remove the data plan while you have the phone active. Blackberry devices require the data plan.
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