Iphone 4s at&t unlocked from ebay?

I just bought an iphone 4s at&t unlocked on ebay and it should be here in couple of days. My question is that I'm a T-Mobile user so will my t-mobile sim card work with it?

Yes it will work perfectly if its unlocked

Yes you can use tmobile with an unlocked iphone, by the way if it wasn't really unlocked or there was any problem you can unlock it yourself.
try the website that my friend has used it to unlock his iPhone for permanent.
it seems they are official apple unlockers.their price was about $25 and they did a remote unlock by

getting the iPhone imei number. They unlocked my friend's iPhone in just 12 hours.

take a look at their website: http://officialappleunlocker.com/

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