"I managed to successfully add a code to my Nuvi 660 but once I clicked back to "traffic" under settings, it keep saying it needs activation and that it will be automatically activated once the gps gets satellite signal and start communicating with the traffic provider. I let my 660 stand for about 15mins with a strong satellite signal on it but the traffic just does not seem to activate or work.

Any idea as to how to activate it or say make it work? "
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At this moment sure "timduncan" has solved his problem. For other users: make sure you are close to high way where the radio signal is strong enough, or at least at an acceptable level.