Windows NT 4.0, Service PacK 4, implements the following dialing rule changes:

 Country   R u l e   C h a n g e   
 Madagascar       International Calling Prefix changed from "16" to "00".    
 Namibia     International Calling Prefix changed from "09" to "00". 
 Spain     International Calling Prefix changed from "07" to "00". 
 Chile     "0" Prefix dropped for long-distance calls.