...The SIM card inserted in this iPhone does not appear to be supported.
The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information.
This is because your iPhone is carrier locked.
What do you want to achieve exactly? Which iOS do you want at the end of the process?
If you want iOS 4.2.1 you have 2 choices:
1- Mess around with the modem firmware (baseband) to get
one that can be carrier unlocked. See this thread and follow
exactly the steps:
[Solved] iPhone 3G Free Unlock Baseband 05.15.04 05.14.02 - No Service Searching - Downgrade iPad 06.15.00 Modem Firmware2- Go to eBay and pay less than $2 to factory unlock permanently your iPhone 3G if it comes from the USA region then use iTunes and let it install the stock iOS 4.2.1 and activate your iPhone and be done with it.
Even if you are stuck in Emergency Mode, you can use the free
iTools (click on English), connect your iPhone and see all the essential info including region & modem firmware.
Since you do not have a Whited00r problem per say, I am moving your thread out of the Whited00r troubleshooting forum to the Free Forum.
Note to other users: if your iPhone 3G is
factory unlocked and running stock iOS 4.2.1 you can speed it up and get all the features by installing
Whited00r Normal version for iPhone 3G and you will not loose the factory unlocked nor the push notifications and can install back stock iOS 4.2.1 using iTunes anytime if you don't like WD.