Okay. That's good.
First of all Trade Dress is protected under both federal trademark law, state trademark laws, and state fair business practices laws.
If your competitor is engaging in business practices designed to confuse the public as to your business versus their business (i.e. acting as if they are you), then they may have engaged in conduct that violates these laws.
Whether or not using a phone number alone is sufficient evidnce of a trade dress violation is difficult to say. I am not aware of any cases that discuss that by itself. Rather the cases generally focus on the entire presentation of one business' product or service in comparison to the other. Also these cases are difficult to prove because sometimes certain elements of a business are just too generic to warrant protection.
If you were able to prove that the other business is engaging in unfair business practices you would be entitled to damages. There are different types of damages.
These include actual damages, statutory damages, and punitive damages. Also the law provides for the reimbursement of attorneys fees. Most attorneys who do this work will meet with you to make an initial assessment of your case at little or no cost. Since attorneys fees are reimbursable to you, it would be wise to at least make a couple calls.
This link can help you find an attorney:
Here is a link to the law:
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