The LG G4 was released in the US in early June 2015, as always focusing on high-end specifications and a refined fashion sense that makes it stand out in the premium smartphone market. Each version of the phone will have a different model number based on if it is sold by a carrier or unlocked (US or International). Some LG G4's are known to have bootloop problems.

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Phone not accepting Sim Card

So my old LG G4 (H815 Factory Unlocked) isn't playing ball with my Boyfriends 3 Sim. The phone is confirmed Unlocked and I've been able to use my GiffGaff sim in the phone which further confirms it's unlocked. However it refuses to accept a 3 sim (Both my new 3 Sim; his and one from the store)

I've tried factory resetting the phone a number of times, rebooting, opening it up and inspecting the prongs. Nothing; any advice?

I've also fiddled with APN settings and LTE/GSM settings.

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Try using a new SIM before going any further. It doesn't need to work so the easiest way to get one is to buy a prepaid SIM kit from any retailer. Since the phone is factory unlocked, you can use any common SIM kit (usually Tracfone/Net10).

If you continue having issues, there's a problem with the contacts on the SIM reader. If you're comfortable with board level repair, you can fix this issue with a new SIM reader. If you are not, then you're going to need a new motherboard.

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See, I failed to mention that it did detect the sim once, it had a data value but no connection. I think a motherboard replacement may be in order though.

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That could mean the SIM is inactive. If you know with 100% certainty it's active then it might be the board.

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Sim is 100% active; it's been working in another phone. Sounds like a mainboard issue

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Sim card not working other phone simcard is working

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