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What's this thing on Samsung Galaxy J2?

pr0ph3t

Expert
⚔️ MOD
Dec 30, 2016
878
22
19,400
I just noticed a small thing which can be opened, besides the rear flash of a Samsung Galaxy J2. I opened it:cool: looks like a circuit board :eek:.
What's that? I have attached the images of it.:confused:
IMG_20170305_154703.jpg IMG_20170305_154641.jpg IMG_20170305_154617.jpg