SWAP!! BLACKBERRY 9900 FOR IPHONE 4S ?

MINT CONDITION BLACKBERRY 9900 WORKS PERFECT BRILLIANT PHONE WOULD LIKE TO SWAP FOR IPHONE4S JUST WANT SWAP AS WOULD LIKE TO CHANGE PHONES DUE TO BEEN USING DIFFERENT BLACKBERRYS FOR PAST FEW YEARS. NO FAULTS WHAT SO EVER WITH PHONE.