Even though WhatsApp, Skype and other apps are mostly used for making international phone calls nowadays, there might still be confusion on the dial codes. Whenever you are using your own US or Canadian cell phone to call a number in Hungary, you are making an international call. You will also need to dial accordingly when using Skype.   

• The International Access Code (IAC) for the US and Canada is 011 and for Hungary it’s 00
• The Country Code (CC) for Hungary is 36 and for the US and Canada it’s 1
• Area Codes in Hungary can be various digits in length
• Hungary uses a trunk code, it is 06
• To call Hungary from the US or Canada, dial IAC + CC + Local Number.

Example: The local telephone number for the Hungarian National Museum is (06)- 3277720. The number could also be listed as +36-(06)- 3277720. In both cases, you would dial 011-36 3277720. Cell phones and VoIP allow you to simply enter the plus sign and wireless networks automatically know it is an international call. Notice the Trunk code (06) is dropped when you dial.