sprint unlocked my samsung galaxy note 3 and att gave a sim but phone is not recongizing sim card

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rybell

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Jun 13, 2017
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I used and bought my -phone with sprint and my daughter has at&t she needs a phone At&t said it is compatible because it does use a sim card, sprint has already unlocked it however phone says invalid sim, is there another reason why its not working.
 
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