Fix SIM not supported in iPhone 3G and 3GS after iOS 4.2.1 firmware upgrade

Fix SIM non supported iOS 4.2.1If we upgrade a carrier unlocked iPhone 3G or 3G S to iOS 4.2.1 firmware or any other version it will lose its activation and become unusable. Those people who bought unlocked iPhone models will get into trouble if they upgrade to new iOS without checking for the availability of compatible jailbreak/unlock tools. The iPhone will then keep itself locked at the “No SIM card inserted” message and with a connect to iTunes screen. And another message ” The SIM card inserted in this iPhone doesn’t appear to be supported” when we connect the device to iTunes. That means you have to get the original carrier SIM card to activate the iPhone 3G or 3G S again. But you can override this using activation of hactivation tools designed for the specific iOS version. Thanks to the iPhone-dev team and other iOS hackers around the world. Now we can fix SIM not supported message in iPhone 3G and 3GS after iOS 4.2.1 firmware upgrade too.

Activate iPhone 3G or 3GS  without original SIM card after iOS 4.2.1 upgrade:
First you need to jailbreak your iPhone 3G or 3G S with iOS 4.2.1.

Download iOS 4.2.1 here.

Download Redsn0w 0.9.6b6.

Now run Redsn0w 0.9.6b6 and point it to the iOS 4.2.1 firmware ipsw. Redsn0w 0.9.6b6 will then process it will take you to the next step. Select to install iPad baseband, Cydia and follow the steps shown in Redsn0w 0.9.6b6 interface to enter into the DFU mode.  Wait for the Redsn0w 0.9.6b6 to complete jailbreak process and reebot the phone. Note that the Redsn0w 0.9.6b6 jailbreak is a tethered jailbreak for iPhone 4 and new iPhone 3G S model. The iPhone 3G and iPhone 3G S ( old bootrom) users can use the following method to activate their phone and fix the SIM not supported message.

Open Cydia, go to manage and then sources.

Now click on edit and add a new source URL

Go back to manage and search for Binger and then SAM and SAMPref from sources, and install them.

Run Redsn0w 0.9.6b6 again and in the second step, select deactivate and continue. Now reboot the phone, connect to iTunes and activate.  That’s it you have activated your iPhone 3G/3G S on iOS 4.2.1 firmware just like the official method.

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14 Responses to Fix SIM not supported in iPhone 3G and 3GS after iOS 4.2.1 firmware upgrade

  1. Tinte.W says:

    I really like it .
    Thanks for your post .

  2. daniel says:

    How do i even jailbreak iphone 3g if i can not pass the sim not suported interface?? is it possible to just run redsn0w bypassing the whole itunes activation step,what i can see is that the phonebook sim no longer works.I AM DOOMED,PLEASE HELP

  3. Ahmed says:

    Yes, u can! just jailbreak it with redsnow and it should be activated then plug it in to itunes 😉
    BTW can someone tell me whether there will be an update 4 redsnow that will support activation for iphone 4

  4. Ryan says:


    i have iphone 3g, and i have no sim.. I just recently did a “restore to factory default” on it.. and now im stuck with the “no sim” message with a usb cable pic on it just like the picture at the beginning of this article..

    then i followed the instructions, downloaded iOS 4.2.1 & Redsn0w 0.9.6b6… and im just stuck with the “downloading jailbreak data…” (the one with the harddisk icon/image on my iphone 3g)… and it wont go through!

    can you help me out? thanks

  5. Team Downhub says:

    Do you remember the iOS version that was there in your iPhone before restoring it to factory default?

  6. DM says:

    I have an iPhone 3GS 32GB, that got updated to 4.2. Sim not supported problem, even with original sim. I’ve gone through this process 5/6 times, still not working. And now RedSn0w is crashing while updating Kernel.



  7. Anil says:

    Hi Ryan,
    If you are using windows 7, please make sure that the redsnow is run in Windows XP Service Pack 3 compatibility mode and that you run Redsn0w as administrator. This will take care of the “donwloading jailbreak” error

  8. D says:

    I did as u mentioned but my Iphone is stuck at the apple logo…How much time does it take to load ???
    Am i doing wrong ??

  9. D says:

    I did as u said..All went well But my Iphone is stck now at the apple logo….How much time does it take to load ???
    Or am i doing it wrong..Plz help me…l

  10. ta says:

    Please help. NO SIM INSTALLED

  11. mustafa says:

    after getting done with the jailbreaking procedures i can access my iphone and cydia and i’ve done all the steps mentioned but still the sim is not activated there is no carrier signal,,,any help??

  12. shirley says:

    I cant access cydia coz my phone is stuck on edit home screen with a dismiss option which jus doesnt work! help!

  13. Win says:

    Hi guys!

    I tried to jailbreak my iphone 3g to fix this problem as your method and it worked!!! Thanks so much.

  14. leeroy says:

    thanks man worked 🙂

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