Google (and other search engines) uses Schema , which is HTML markup that defines structured content (which has a phone number), so if you want your phone number to look good, it will include structured data. For example
<div itemscope itemtype="http://schema.org/LocalBusiness">
<span itemprop="telephone"><a href="tel:01234555666">Link Text Here</a></span>
</div>
, , Address, Reviews, Maps, Logo .. .
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<a href="https://plus.google.com/your_profile_id/?rel=author">Tim Baker</a>
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