Originally Posted by
moondog
As others have said + or 00, followed by country code, is the proper syntax when calling from almost all countries. USA and Canada are outliers by using 011.
Taiwan by default uses 002, although you can also use other prefixes if you want to specify another service provider or take advantage of some discount plan. I believe neither HK nor Japan uses 00 either. I agree 00 is the most common, but there are many exceptions.