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Ever since that I got the cyanogen 7 it says that no SIM -- but it is in there. I was wondering how to solve the problem It has been ... quite and adventure.

What I've tried:

First I tried Heimdall from Ubuntu (didn't even connect to the phone). Then I tried from Windows, using its graphical interface. It had the "repartition" flag activated by default, when it shouldn't, so I bricked my phone.

After lots of trial an error, I managed to install a ROM in my phone, using Odin as root, the stock cable, and a different USB port than the one I was using (go figure...). And from there I was able to install cyanogenmod as it says on the instructions. Then I had to reinstall them, because they were bootlooping.

END TL;DR

Current Status:

So, now I've got a Samsung Galaxy S with Cyanogenmod 7. But it complaints that it doesn't detect any SIM card. When it boots up, it says No SIM card. Emergency calls only. Notice that it doesn't say "incompatible SIM", nor it asks me for a password of any kind. It just doesn't seem to detect the card at all.

Question:

What steps can I follow to solve this issue, or at least get more information about it?

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Since you soft-bricked your phone I would ask to test a stock ROM and see if the SIM fails or it works as intended. If the SIM fails, it might be something of your phone, not the ROM. –  Peter Feb 6 '13 at 13:20
    
Find the appropriate PIT file for your device and flash the original, signed, stock OS via Odin with re-partition checked and that PIT selected. Then see if the SIM card works on that firmware. –  Matthew Read Feb 6 '13 at 21:29
    
Have you tried reseating the SIM card or cleaning its contacts with rubbing alcohol? Does your SIM card function correctly in a known-working phone? Sometimes it's the silly things. –  Mr. Buster Mar 8 '13 at 23:06
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1 Answer

SIM card interface is connected to the Baseband processor. The error message you are seeing most likely means that during conversion to Cyanogen you have erased and/or reflashed BP image. The easiest way to reverse is to go back to the stock software. After telephony is functional again - you should ask for help with the proper Cyanogen installation procedure for your device.

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