I bought an unlocked Iphone 4s from ebay and its stuck on an SIM not valid screen?

The Iphone should be unlocked. Phone won't even take me to the main menu and i can't even use it as an Ipod. I went to tmobile and got the SIM card and when I put it in it says it wasn't valid. I'm so confused and I'm thinking the phone isn't valid. What should I do now?

Contact eBay first of all and see what to do maybe you could ship back the item an get your money back dnt buy phones off eBay again

You need to make sure that phone was unlocked. Verify that buy plugging it into iTunes. If that doesn't help call customer service at 1-866-454-7126! Chances are someone sold it as unlocked when it wasn't that is why it is show as invalid sim!

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