Will T-Mobile Let Me?

I want a smart phone for its multi-media capability. However, I don't want a data plan. Can I buy the phone at full price and sign up for the data plan for a month, and then cancel the data plan? Or, perhaps sign up for their Even More Plan which has no contract. I would sign up for which ever version allows me to get the smart phone and then cancel it the next month and switch to one w/out a data plan. Pretty much all good high end cell phones are now considered smartphones which carriers force you to buy a data plan. I almost never need the surf the web on my phone. In a pinch, I almost always have WiFi.