Can I block outgoing international calls from my AT&T CallVantage service phone?
Yes, you can. With International Call Blocking you can block outgoing calls to international phone numbers (it does not block calls to Canada, Puerto Rico, the U.S. Virgin Islands, or Guam). It does not block incoming international calls. International Call Blocking can only be set by the Master Account. It can also be turned off at a later time if you decide you want to allow outgoing international calls. International Call Blocking is an included feature available to you at no extra charge.