Why does my unlocked iPhone 3GS stay locked?

I jailbroke it with redsnow, unlocked it with Ultrasnow a million times over and it remains locked. Using baseband version 05.13.04 with 5.1.1 iOS. Calls and text work fine, but no data, no matter what. Use Wi-Fi in my house, but that's all i can use. I've spent a week doing this over and over and nothing seems to work. Tried dozens of videos online, countless blogs and i followed every, single step x amount of times. Using straight talk right now, should I try T-mobile maybe?

Is it a tethered or untethered jailbreak?

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