The 2 pins to the left side of the camera are for a Qi Wireless charging, which you can upgrade your backplate with, which has a sticker in it that normally only carries a NFC sticker without Qi. Qi+NFC stickers can be found all over amazon for around 10$.
Now to the 4 pins to the right of the battery.
The lower 2 of them are NFC as you can already see on your backplate that came with your LG G4.
I dont know what the upper 2 are for, but i dont think their for a "Radio sticker" as i havent seen any and the G4 uses, same as on some Apple devices, the headphones as an antenna.
I hope i could help ;)
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Someone, for the love of kittens, tell us what those top 2 of the 4 pins do!
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