So I’ve been looking into modifying the fp4 and I found that the physical wiring is there for a second Sim slot. So is there a way to solderer on a second slot and make it work? I know that there might be software lacking but since the physical part is there couldn’t we use a custom OS and add the …

Well, upfront: I cannot provide any information for you (I’m sure you are fully aware of the warranty certainly being voided once you modify the hardware like that), but I’m already grateful for your photo – first time I get to see the opened :heart: core module :+1:

oh ya I’ve already done so many things that voided the warranty that at this point as long as I don’t break my phone it’s fine

This immediately begs the question: Why the fuck don’t they ship their phones with 2 sim card trays out of the box, when the hardware is cleary there?? I am very negatively surprised by this, since they purposefully made the phone worse than it could’ve been.

It might not actually be there. I can’t follow any of the lines because it’s all black so it might do nothing. But then why is it there? It’s all just really weird. My theory is that they wanted to and they put it in the prototype but for a reason had to remove it but were too far along to change th…

Does this somehow help? [image] Fairphone 4 schematics The Products It seems there is news, at some point schematics for the Fairphone 4 became available. I discovered this from a recent Louis Rossmann video: [Why I was wrong about fairphone] Indeed, they ca…

Ya thanks! It’s going to take some time for me to check all of this but at a glance all the physical wiring might be there so this should work

At least on the schematics, the traces for that missing socket appear to be connected to UIM2_DATA, UIM2_CLK, UIM2_RESET (the three relevant connections to the SIM card), and UIM2_DET_N (card presence detection). These go to GPIO_75 to 78 on the SM6350 (page 36 of the pdf). The schematics actually…

Ya that’s one of my theories, that you can only have two sims with the chip they use and the they took the second sim for the esim but for some reason never removed the wiring for the second sim. But looking at the schematics I found that the NFC_SWP pin is connected on the sim1 to Vpp and that the…

[image] Atlantian: My plan is to wait a few days to see if fairphone answer and unless they respond and tell me a good reason why I can’t do it I’m going to order the parts and try it. I’m going to first try it by just soldering on the slot and try it if it doesn’t work see if i can remove the e…

Ok so I check all the components and ya a lot are missing, this is the list; T4609 T4608 T4601 C4607 R4607 R4606 T4607 R4601 C4605 T4611 and these aren’t in the list of components even if they’re on the diagram So this got a lot harder but I still want to try [IMG_20230131_160222_237]

Physically add second sim

Help Fairphone 4

yvmuell January 30, 2023, 8:38pm 6

Does this somehow help?

Cellular antenna port on Fairphone 4