query: #title: Check for country code
  # Complex constraint from [[Property talk:P2900]]
  # Entries should start with "+" and the country code (+1 for US numbers)
  SELECT ?item ?itemLabel ?value
  WHERE
  {
  	?item wdt:P2900 ?value .
  	?item wdt:P17/wdt:P474 ?cc .
  	FILTER(!strstarts(?value, ?cc)) .
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } 
  }
  LIMIT 1000