BlackBerry has struggled as of late, but it’s trying hard to lure users over to its latest hardware. The _company today announced that it’s offering a ‘trade-up’ program_that could save iPhone owners up to $550 on a purchase of a Blackberry Passport. The payment is split up into a $150 as a Visa Prepaid card for every device, plus up _to $400 dollars depending on the model and condition of the phone. Blackberry is accepting every iPhone model since the 4s, but that model will only net you $90 in addition to the $150 card. The trade-up program starts on…

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