How to activate iPhone 3GS after factory unlocked?

I just factory unlocked my iPhone 3gs using IMEI unlock method by restoreing using iTunes. This service was purchased from eBay. This is the second one I did. First one work just fine. The second phone, I think it unlocked it fine, but now I'm stuck on the activation window. I used a AT&T go prepaid sim card, when I try to activate via iTunes, it says the there's no sim card installed. I tried with t-mobile sim as well with no luck. My question is how do I activate my phone now?

You should really check out the new Unlimited everything (including hotspot) plan that just came out. Runs off T-Mobile and at&t's 4G network for $49/mo and ends up bein free or making you money every month instead. It just launched in September and is taking the money that would other wise be wasted on the same old repetitive advertising and giving it to the people for sharing with others. $20 for every 3 people you enroll every month for as long as they have the service+another $20 for every 3 people they add as well… It adds up let me tell ya. Also coming to Europe next year

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