Need help, no internet

:confused:i need some help people, i have a 3g 2.1 and i set the apn, username and pass according to the carriers settings, still no internet? is it b/c of the unlock sim card that i'm using? some say that some of them(turbo, universal, rebel) have everything working as if were factory unlocked and some only let u call and text? or do i have to make a custom carrier bundle? really need ur help!!!

In the top left next to your carrier's name is there an edge or 3G notification (E or 3G?).

I'd recommend taking your sim out of your iphone and trying to browse the web with it using a different phone, before popping it back in the iPhone and trying again.