I have a iphone 4 factory unlocked usa but the proximity sensor not work and dont have option to edit the apn.

The proximity sensor in my
Factory unlocked iphone 4 usa not work and not have option to edit the apn for the network.

you'll have to bring it back to the apple store for repair/replacement.  Warranty services is done only in the country of purchase, so you'll need to bring you phone to a US apple store.

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