Yes if it has the hardware. For example if i put my straight talk at&t into a Samsung galaxy 2 for t mobile, it would have 2G.
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Your Straight Talk SIM in the USA will either be connected to T-Mobile or AT&T. Since I regularly switch SIMS for both networks, I can confirm that it runs quite well on both. At home I have good coverage from both carriers. My average download speed is about 6 to 8 mbps on AT&T, and 12 to 14 mbps on T-Mobile.
I have straight talk and never had those speeds. Or when I was on at&t. Kinda surprised t mobile is faster for you.
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