How do i activate a pantech duo cell phone?

i just got a pantech duo cell buzz, and i was told i have to call this certain acivation number to get it to work. anyways, i have lousy service where i live, and whenever i call the number it says the service is unavailable. but with my ancient cell buzz, i could still gets calls out even with the lousy service. does anyone know why this isn’t effective?

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