Can you fully use an iPhone or a Blackberry in Canada if it has been bought in Bangladesh?

And is there a considerable difference between the price of an iPhone or a Blackberry in Bangladesh and the price of iPhone/Blackberry in Canada?It has to be unlocked. http://answers.yahoo.com/question/?qid=20100410093759AADvVAL

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Source: http://ipad-iphone-ipod-update.com/2011/06/can-you-fully-use-an-iphone-or-a-blackberry-in-canada-if-it-has-been-bought-in-bangladesh/