Saman Saadi
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International Direct Dialing
If you want to call an international number, first you need to dial exit code or more formally international direct dialing (IDD) of origin country. In most European and all Middle East countries it's 00. Suppose that you want call a Canadian number from Iran, a country in the Middle East. The exit code in Iran is 00 and the country calling code for Canada is 1, so you need to dial 001 and then the Canadian number.
