Yes, the number is 1-800-come- here!! J/k, my friend killed a buck this morning grunting and rattling, we just grunt when we see em, never have actually just grunted for em when i dont see em. good question.
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The ability to get close to game remains the essence of all bowhunting today.
use the calls when the deer are visible...then you will see how they react. it may be good to have a general knowledge of when and why to use certain calls. i have a primos video that explains it...ive also seen info on calling on dif websites. good luck
Don't waste your money on any of those videos or calls, just eat an entire pound of baked beans the night before and don't be bashful the next morning, you will be amazed at the results.