Tidy up a bit this code

actionpack/lib/action_view/helpers/number_helper.rb

@@ -63,14 +63,16 @@ def number_to_phone(number, options = {})
         extension    = options[:extension]
         country_code = options[:country_code]
 
-        str = ""
-        str << "+#{country_code}#{delimiter}" unless country_code.blank?
-        str << if area_code
+        if area_code
           number.gsub!(/([0-9]{1,3})([0-9]{3})([0-9]{4}$)/,"(\\1) \\2#{delimiter}\\3")
         else
           number.gsub!(/([0-9]{0,3})([0-9]{3})([0-9]{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
-          number.starts_with?('-') ? number.slice!(1..-1) : number
+          number.slice!(0, 1) if number.starts_with?('-')
         end
+
+        str = ""
+        str << "+#{country_code}#{delimiter}" unless country_code.blank?
+        str << number
         str << " x #{extension}" unless extension.blank?
         html_escape(str)
       end