Why can't I activate my iPhone 3G?

So about a month ago I found my old iPhone, since I couldn't remember my old pass code I had to restart the entire thing, then I had to follow 4 simple steps to activate my phone, when I get to the last step it keeps saying "We can't active your phone try using iTunes or try again in a couple of minutes" I tried activating it with iTunes but it still won't work, can some one help me

Plug in the iphone to itunes then click restore. It should set it back to the original factory settings. But you will lose everything on there. So your best bet is that

Try this:
Insert your sim card properly and download and install the latest itunes. You can then sync it to the computer. Once detected, itunes automatically starts and ask you to download and update, click it to update to the latest and click ok after download is done.

The next thing is that it will ask if you want to register, just click register later if you don't want to register. If you click register later the next step is to you are to type your phone's name like mj's phone or whatever you want then the next screen will promt you to update or restore your old system. If you decide to update you are going to wait because the update will be about 200 to 250MB.

This will not just activate your 3G but it also updates it.

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