How I can unlock my Iphone 3gs from At&t and use it in Europe on T-mobile?

I bought my I phone locked on At&t and I want to use it in Europe on T-mobile network. How I can do that. Do I need to call At&t or there's another way?

Yeah! You can ask At&t to unlock your iPhone 3GS, in case if they don't unlock your phone, you can still do it through online sites by Remote unlocking Method.http://www.simpleunlocking.com/apple-iphone-3gs/rs16wp9/ is where i unlocked my iPhone, Check it out!

Ask at&t if they can do it for you
otherwise you will have to contact third party
i know that one

http://www.vunlock.com/
they will provide you the unlock code if they can (because i don't know whether at&t unlock iphone r not)

You may unlock it, there are a few different things you could try.

First would to have it done, for free, by AT&T directly.
You'll need to go to their website (http://www.att.com/esupport/article.jsp?sid=KB414532&cv=820#fbid=FmdF7tI5pGc) to see if you're eligible. If you're eligible click on, "online unlock request form" and fill it out. You may also call AT&T and contact them that way.

However, if you're unable to do it through AT&T, you'll have to use a 3rd party unlock service. I had to use a 3rd party unlock service because my contract with AT&T isn't up yet, but I'm studying in Finland for a year.

This one vendor on eBay, unlock_fusion, (Well known and trusted, feel free to Google for more information) is currently unlocking AT&T iPhones for only $9.75. I did this last night and it took about 6 hours for my phone to be unlocked (They say it can take anywhere from 12-24 hours).
(Here is the listing for the unlock: http://www.ebay.com/...0813748947

Whichever route you choose, once your phone is unlocked you will have to perform a backup and restore of your iPhone. After you do the backup/restore a message will pop up letting you know your iPhone is unlocked (Should look like this: ).

I hope I was able to help you out.
Should you have anymore questions, feel free to contact me.

Good luck and enjoy your unlocked phone!
- Cameron.

You can unlock this by jailbreaking via software.

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