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crwdns2930797:0crwdne2930797:0: crwdns2931709:0Which part of the phone has to do with SIM...
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Which part of the phone has to do with SIM functionality?

I dropped my phone in soup (I'm not looking for help with water damage, I already took care of it), but mobile data is not working and I'm not sure if it's the phone or the card. Can someone point me to the area of the phone that has to do with SIM function or should I just give up?

Edit: I got some images from the teardown video (they're better than any I could take). I do need to make it clear that I'm very new to this and that I simply don't have most of the equipment that your suggestions would require. When I say that I'm not sure if it's the phone, I mean that I'm not sure if the moisture may have caused parts to malfunction. I was already thinking about ordering a new logic board and replacing it myself, as I already took it apart a few days ago and there didn't look to be any signs of corrosion, but I could always be wrong. I'm currently acquiring a SIM card from a friend to test if it's the card or the phone. It's looking like it might be the phone though, I put the SIM card into an old phone and the phone did detect the card and registered that it was from a different carrier, so If someone could point out which part of the logic board would have to do with SIM functionality so that I could check for anything that looks out of the ordinary, that would be very helpful!

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Great question! Let me first answer by saying NO you should NEVER give up. ANYTHING and I do mean ANYTHING can be figured out with enough energy and time. So let's continue.

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It could be either one. Your phone or your sim card. The best way (in my own opinion) to test a sim card is to call your phones carrier using another phone so they can have you run tests. So if you use Verizon call them up, Straight Talk, Sprint, Etc, call them up. They can actually diagnose a lot better than you or I can. In addition you can make the call toll free and do not need to obtain an additional sim card.

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However they may just tell you it is the sim card because your device isn't registering the sim card. In which case as @avanteguarde stated your next step would be to acquire another sim card that you KNOW works. The issue with this is, its more work than making a phone call.

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First you will need to find a SIM card that works with your phone, and carrier. Then you need to have your carrier activate the new SIM card in order for it to work with data etc. Then after that if it doesn't work, you will either need to reactivate the old SIM (if you borrowed sim card) or think about replacing the phone / part.

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Now if it comes down to the phone needing repair we have three options. Junk the phone, Send the phone in for repair, or do it yourself and un-solder your SIM card reader and solder a good reader in it's place. Be warned the motherboard my just be faulty in that area, in which case replacing the reader does no good, you will need to replace the motherboard.

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The good news to that is, motherboards are much easier to replace then to start soldering and un-soldering things. There is no official motherboard replacement guide, however there is a tear-down guide that if you watch carefully, could use to identify your SIM Card reader and replace it as well as the motherboard. You can find that here.