Whatever mobile discounts/promotions you have at present, are lost if you change your plan.
They may word it like you look like your gonna keep them, but you do not.
If you scroll to the bottom of any Virgin mobile webpage and check the small print in Offers and Extras - you'll see all your offers cease if you ever change your plan.
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BB 200 - Hub 3, Phone Talk w/ends, Mobile Sim only. Customer since 1993.