Straight Talk iPhone 5

I bought an iPhone 5 on Straight Talk from Walmart on March 1 this year. I have been on ST for about 2 years. Before I got this iPhone, I was on an LGC900 Windows phone from ATT, but I switched to ST. I could use internet, apps, etc without being connected to Wi-Fi. Now that I have the iPhone 5 on ST, I can't do ANYTHING but Text and call without being connected to Wi-Fi. Instead of saying "HOME" like on my Windows Phone, it says "TFW 3G". I didn't pay $800 to just text and call. I've gone to http://iapnupdateatt.straighttalk.com to set up my APN, and it did not work. I have dialed *22890 MULTIPLE times to fix the problem, but it did not do anything. I've called ST and they didn't know what was wrong. What can I do to fix this, other than jailbreaking it!

Added (1). I don't want stupid answers. I want answers that will actually RESOLVE this problem.

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