Help with a free treo

I had a Treo 650 for three years and loved it. Unfortunately the 5 button broke or I would still be using it. I ended up getting a Samsung SGH-a737 (junk, junk, junk) for an up grade. I have now had two screens break in two months. My friend received an iphone for his job and is using the company plan. He gave me his Treo 750 that is not three months old but its with Sprint. Is it possible to get this to work with ATT?

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I will come back to you on that once I check something