Dialing Iran
The other type of code is Iran National Direct Dialing prefix (or NDD). It is used only when dialing to a destination within the Iran. Iran NDD code is only used as long distance dialing within the Iran. Do not use Iran National Direct Dialing prefix when dialing from outside Iran into Iran.
For Iran long distance, you have to dial Iran National Direct Dialing prefix (or NDD), City/ Area Code, and then the subscriber telephone number respectively as:
+98 (Iran National Direct Dialing prefix code) + City Area Code + Number you wish to call.
On the other hand, International Dialing Iran Code or Iran International Direct Dialing prefix (or IDD) is used when dialing from the Iran to outside Iran. Do not use Iran IDD code when dialing within Iran for long distance.
On the other hand, when dialing to Iran from outside Iran, a Iran Country Code is used . Iran Country Code however is not used when dialing within Iran.
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