I have a Samsung sgh-t339, which is t-mobile, but is unlocked. How do I get the wifi to work with att 3g? Thanks?

Wifi and 3G aren't the same, they are far from it in fact, to set up wifi you will need a wifi access point ( a wireless router or modem) and has nothing to do with what network you are on. Check your phone manual for the set up details of WI-FI 3G however you will require the details from AT&T just ring them and if they support your phone they should be able to send the settings via SMS. If they won't give you the settings for 3G here is what I have found on the net, I can't confirm that these are correct or work though forum.xda-developers.com/showpost.php?p=... Settings.

Unlocked simply means that you can use it on any GSM wireless carriers network. That provides you with the wireless cellular service. Wi-Fi is carrier independent and can be setup through the phones settings.

Here is a link to the Manual: samsung.com/us/system/consumer/product/2....

You can unlock your mobile using unlock code...you can get the unlock code here mobile-unlocker.com/unlock-your-phone/rs... It provides unlock code and instructions...By using this you can unlock your mobile easily...

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