I want to buy a used i870 off of ebay and am wondering something. If I buy a used i870 can I simply put my nextel sim card into it from my i580? Will it work or will I have to unlock the i870 first? I once bought a used sprint handset and they said I coulden't activate it because the previous owner owed an outstanding bill and I don't want to run into the same issue with a used nextel phone.


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