What website can I trust to unlock my iphone 4?

Bought an iphone 4 off of ebay that was suppose to be unlocked and jail broken. It was jail broken but not unlocked. I think the seller updated the software which locked the phone back up. The seller offered to pay for me to get it unlocked. So are there any trustworthy sites that will unlock it. I've heard mixed reviews about gsmfast.net. By the way I have baseband 4.11.08, ios 5.0.1

There are no legit sites, they are all scams.
only the original carrier can unlock.
do be scammed by those fake sites.

You should unlock it yourself, look for a tutorial, but don't get tricked into paying for anything.

Sorry sweetheart, but no can't do. See, you have a baseband that it's unlockable for now, well, in a way, because you could pay $150.00 and it will be unlock no matter which baseband or firmware, because this what you called a factory unlock, which can only be accomplish with the help of AT&T or by paying this amount.
Now, there's no code for unlocking this phone, for now, the only baseband that can be unlock with Ultrasn0w is 1.59.00.
But there's hope, Musclenerd has already unlock, twice, an iPhone4 with 4.12.01 baseband on IOS 5.1.1, all we have to do is wait for the release, hopefully.
I hope I'm wrong on this but I've been trying and following these type of tech new for a very long time.

Buying jallbroken things is a scam you just lost out if you had at least half a brain you would not have paid for somthing that was free

You can unlock your iPhone 4 by remote unlocking. The unlock is permanent and it does not cause any alterations in the iPhone's firmware.http://www.superunlockcodes.com/apple-iphone-4/rs12wp9/ is where i unlocked my iPhone, they offered good unlocking service. Check it out for yourself!