Telephone country code +98 is Iran, and +98 21 is the area code for Tehran.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code and area code of Babol, Iran is 98, (0)111.
The country code and area code of Golestan, Iran is 98, (0)171.
Mashhad is in Iranian telephone area code 0511, which is +98 511 in international format.
Country code +98 is Iran.
Telephone country codes never begin with zero.Country code +298, dialed as 00 298 from many places, is the Faroe Islands in the North Atlantic.Country code +98, dialed as 002 98 from many places, is Iran.To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +298 or +98), omitting any dialing prefix.(The plus signmeans "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The country code and area code of Ardabil, Iran is 98, (0)451.
The country code and area code of Fars, Iran is 98, (0)711.
The country code and area code of Gilan, Iran is 98, (0)131.
The country code and area code of Hamedan, Iran is 98, (0)811.
The country code and area code of Hormozgan, Iran is 98, (0)761.
The country code and area code of Ilam, Iran is 98, (0)841.
The country code and area code of Kerman, Iran is 98, (0)341.