I'm guessing in your situation, that you have an international plan on your phone.
You probably don't even have to think about how to dial.
Even though I lived in Germany a long time, I have the re-remember what to leave off and what to add when calling internationally, and you can bet that most in the US (and Canada?) have no clue since our phone numbers don't work that same.
The one time I called AN, they were looking for the person I needed, I was on hold for a long time, he was on the phone, he would call back - didn't happen. I called Norvil for a problem repeatedly and end up getting it fixed via email. I have never successfully called RGM. I'm not wasting money calling any of them again!