phone_to tag similar to mail to

 supports blocks and creates tel:number tags

      # Creates a tel link tag to the specified +phone_number+, which is
      # also used as the name of the link unless +name+ is specified. Additional
      # HTML attributes for the link can be passed in +html_options+.
      #
      #
      # ==== Examples
      #   phone_to "+112345567"
      #   # => <a href="tel:(02) 12345567">+112345567</a>
      #
      #
      # You can use a block as well if your link target is hard to fit into the name parameter. ERB example:
      #
      #   <%= phone_to "+112345567" do %>
      #     <strong>Call me:</strong> <span>(01) 12345567</span>
      #   <% end %>
      #   # => <a href="tel:+112345567">
      #          <strong>Call me:</strong> <span>(01) 12345567</span>
      #        </a>
      def phone_to(phone_number, name = nil, html_options = {}, &block)