Can I use my unlocked iPhone 3G for T-mobile prepaid plans?

I currently have Verizon and I don't like their high prices for data, so I want to switch to T-Mobile. I would like to use my unlocked iPhone 3G for their prepaid $30/month plan for unlimited texting, 5GB of data with 100 minutes. It is the perfect plan for me and I don't want to miss out on it. I have been researching this for such a long time and I can't get a straight answer. Some people say, "Yes, you can use an unlocked iPhone for T-Mobile prepaid" while others argue that you can't. I just want one simple answer to the yes or no question.

Can I use my unlocked iPhone 3G for a T-Mobile prepaid plan?

Thank you

Added (1). I'm also okay with using another touchscreen smartphone, if anyone has any suggestions that would work on the prepaid plan.

Yes they are making right now a "pre-paid iPhone"
Call up straight talk (pre-paid from walmart $40 a month unlimited everything)

You sure can. The only thing is, even though your iphone is 3g enabled, it will be running on t-mobile's edge internet speed for now. Which means it is slower than 3g - for now. I was at t-mobile today, by the end of this year, or early next year, your phone should be able to get 3g speeds with t-mobile.

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