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I just went to one of my sites and I see an Adsense ad with some text and then the phone number! I'm going to filter the url from my adsense account. We see all this discussion of webmasters potentially ripping off advertisers by clicking on the ads. This is the reverse situation. An adwords advertiser trying to get free leads.
I'm going to have to check my adwords account to see if that breaks the TOS.
Kind of defeats the whole biz model if they allow that. If someone is going to click on it anyway, you don't need the phone number in the ad. If they are going to call instead of click then they are circumventing payment for the ads.