Country code +30 (dialed as 00 30 from many places) is Greece.
All landline numbers begin with +30 2.
All mobile numbers begin with +30 6.
(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 +92300 is assigned to Pakistan. Country codes are used in international telephone dialing to indicate the country from which a call is being made. In the case of Pakistan, the country code +92 is followed by the specific mobile network code (300 in this instance) to complete the full phone number.
The country code and area code of Abottabad, Pakistan is 92, (0)992.
Country code +92 is Pakistan.
The country code and area code of Chitral, Pakistan is 92, (0)943.
Country codes never begin with zero. Country code +92 is Pakistan.
The country code and area code of Bahawalpur, Pakistan is 92, (0)62.
The country code and area code of Badin, Pakistan is 92, (0)297.
The country code and area code of Mardan, Pakistan is 92, (0)937.
The area code for Karachi, Pakistan, including Nazimabad, is +92 21. Within Pakistan, dial 021.
The country code and area code of Awaran, Pakistan is 92, (0)856.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +249 is Sudan, and +249 92 is a mobile.
The country code and area code of Khyber Agency, Pakistan is 92, (0)924.