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The option to change the URL is grayed out. Is there a way to do this or do I have to create a whole new campaign?

Is it a best practice to place your company's phone number in the meta description for a page? Are there any rules as to what is acceptable for meta tags? One of our competitors recently started doing this but for some reason I think it might be against Google's guidelines. They (competitor) is also engaging in web spam, plagiarizing our content,  and other black hat techniques so I'm leery of anything they do.