The Samsung Galaxy A3 (2017) is a mid-range smartphone in the Galaxy A series. It was unveiled by Samsung in January 2017 together with the Samsung Galaxy A5 (2017) and A7 (2017).
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Ifixit has screens in stock but I didn't see yours. The phone is a cheaper model made as an entry level phone for usually prepaid carriers like straight talk, cricket, metro pcs. The only place I can find a screen is on Ebay. I hope this helps.