Samsung SPH-W3300 Slider for KTF

Samsung launches in Korea the SPH-W3300 slider mobile phone. The Samsung SPH-W3300 features a 2-inch LCD display, a 1.3 Megapixel camera, integrated media player, Bluetooth and a microSD card slot. The W3300 supports WCDMA 3G and GSM networks. It will available in Korea through KTF.

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I bought my phone in Korea. There I used KTF service. Now I am in country which uses GSM Networks . The frequency is 950, which is I think supported by this phone. Does anyboy have an idea how i can reset this phone so that it starts using GSM Networks instead of WCDMA
I also got this phone model as a give. I want to reset this phone so that i can use it here where GSM is the network being used. Please do help me here.
Thanks.