Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I suspect that your phone is defective.
But to check and be sure first, also check that you are using more than one phone cable to the phone, when you try it out.
And also - you might doubtfully be plugging the phone cable in to the wrong jack on the phone's base unit. If there are two such phone cable jacks on the base unit, try plugging into the other one. One of the two may be a 'pass-through' port, and not work if connected to from the phone line (as opposed to having another phone-type device, e.g. fax or answering machine etc.) work through it.
After that, if it still has no dial tone (and if you are sure your phone service isn't down, causing the lack of a dial tone), contact the Amazon.com seller, and tell them you are returning the goods because the phone is defective, and you would like a refund, or perhaps you would like to exchange the defective phone for a new one of equivalent value and capability.
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