Unlocking iphone iOS 6.1.3 t-mobile uk?

So i'm having trouble because my sim card doesn't work on my iphone. I need to unlock it first. But the thing is, redsn0w or any other unlock doesn't work on this iOS.
i really don't know what to do, i was trying to look for an unlock ebay but they all are really expensive (£100)
is there anyone who knows how i can unlock it? Or anyone who are willing to do it for me for about £2o?

First you must find out the carrier of your phone.
http://iphoneimei.info/

then i suggest going one ebay. I got mine unlocked there for £1

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