Its w580i for music and 73 is best for cameran73 hang a lot but w580i dont hangn73 is slow compare to w580in73 has 8 mb ram and w580i has 10 mb ramw580i has good picture quality but n73 has 3.2 p so n73 is bestw580i has tracker id n73 dont havew580i can count how many steps are taken n73 dont counttheir is only one problem in w580i it warms if u give w580i to service center for repair then w580i is to good n73 features are good but not in india so i say w580i is the best
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