Fix Factory Unlocked iPhone 3GS ‘No SIM Card Installed’ Error After iOS 6 Update

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Just updated to iOS 6 but getting the iTunes error “There is no SIM card installed in the iPhone you are attempting to activate”? Here’s how to fix it.

This is a rather weird issue because you already have your SIM card inserted but iTunes is saying otherwise. What’s even more weird is that you have an iPhone 3GS which is already factory unlocked but won’t activate normally (or if you have an AT&T iPhone, and need to unlock it, click here).

If you have baseband 6.15.00 installed before, for whatever reason iTunes won’t let you activate your iPhone on iOS 6. Apple may have quietly put a this restriction in place. In case you missed the news, you can now downgrade from iPad baseband 6.15.00 to 5.13.04.

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

Try the following fix:

1. Download redsn0w 0.9.14b2 that can downgrade iPad baseband to 5.13.04 for Windows or Mac. Download original firmware iOS 5.1.1 for iPhone 3GS from here.

2. Launch redsn0w. Go to Extras > Select IPSW button in redsn0w to point to the original firmware you just downloaded.

3. Do a controlled shutdown of your iPhone (“slide to power off”).

4. Return to the first screen and click ‘Jailbreak’. Check the ‘Downgrade from iPad baseband’ checkbox, uncheck Cydia and click Next.

5. Redsn0w will start doing the downgrade and you will see ‘Flashing Baseband’ screen on your iPhone with the Pawnapple icon. DO NOT INTERRUPT your iPhone while baseband flashing is in progress.

6. When done, your iPhone will reboot itself and the baseband should have been downgraded to 5.13.04. Try to connect to iTunes once more and see if it would activate.

If you don’t have an official unlock, you may want to consider using this tutorial.

Any comments or issue?

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Fix Factory Unlocked iPhone 3GS ‘No SIM Card Installed’ Error After iOS 6 Update was last modified: July 16th, 2019 by Joe Wang

Comments & Discussion

  1. I have gone through this process but I dont get the pineapple screen coming up. instead it does start loading or downloading jailbreak data but at the end of it the screen shows the following:

    Please wait….
    Please wait…
    Please wait…

    Transferring control to jailbreak…
    dyld:code signature for shared cache failed with errno=7

    The screen on the phone then sticks in this position?

    any suggestions..

  2. The SIM card inserted in this iPhone does not appear to be supported.
    This iPhone is not currently setup to work with carrier you're attempting to use. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked.

  3. I recently updated my iphone 3gs, now it wants to be activated. I have a sim card installed but it says no service. What can i do to activate it?

  4. i got struck with an error dyld: code signature for shared cache failed with errno=7".. my ios version was 6.1.3 . plz help me out..

  5. Tried this, waste of time
    My iPhone 3GS was saying No Sim because the SIM tray connectors where Broken.
    There should be six of those bronze little pins which should make contact with the SIM card when inserted.
    Well three out of six of my pins where somehow missing, I guess they where broken when someone ripped the SIM tray holder out.
    Try removing the SIM tray holder of your phone and shine a flash light inside the slot to see if there is any damage, even pocket dust. If you see something unusual then your problem lies there and the solution is to take your phone to a technician for repairs.

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