3G won't work on iphone 3GS?

I can't get 3G to work, it said I needed to turn Cellular data on or something so I turned it on and it still wouldn't work, it comes up on the screen 'Welcome to Talkmobile. To ensure your handset is set up for picture messaging and the mobile initernet, we can quickly configure it now, free of charge. Simply click yes to start' then it has cancel and accept as options, click accept and it says 'start download' with yes or no, I click yes, it says it's 'checking status' then goes off and says 'can't complete service, please try later' and it says that everytime, how do I set it up?

Connect to Wi-Fi and goto apn unlock and make new apn for your carrier.

Do a hard reset to the iphone allowing it to reboot and refresh any changes allowing it to work. Also if fail factory reset bearing in mind youll lose all your saved data.
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