This is what Fido's site says for the HUP checker:
Quote:
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You are eligible to upgrade to iPhone 4 16GB at $159 (after a $490 bill credit or discount off the no-term price) and 32GB at $269 (after a $480 bill credit or discount off the no-term price), each with a 3 year Fido Agreement and Data Add-on. You may use your FidoDollars towards the purchase price Full conditions below, see in-store for details.
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No mention of stacking.