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ESN - ELECTRONIC SERIAL NUMBER is something every phone has some company carriers use it to active a phone ex: verizon , sprint if you want to port over your service then you need to call verizon and give them your new ESN to activate your phone theres not really an unlock that you can do with cdma phones so if ur trying to use a sprint phone on verizon services that i knw of but it looks like
ur SOL < shit outta luck
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