query: #title: Check for country code
  # Complex constraint from [[Property talk:P1329]]
  # entries should start with "+" and the country code (+1 for US numbers)
  SELECT ?item ?itemLabel ?value ?cc
  {
  	?item wdt:P1329 ?value .
    	?item wdt:P17/wdt:P474 ?cc
  	FILTER(!strstarts(?value, ?cc))          
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en"  }    
  }
  LIMIT 1000