'00' is not part of the country code, it is a commonly used international access prefix. Country code +242 is the Republic of Congo (Brazzaville), and +242 06 is an MTN/Libertis mobile.
Note that the Republic of Congo is an exception to the general rule of dropping the leading zero from the national number when calling internationally.
00 is not part of the country code, it is a commonly used international access prefix. Country code +242 is the Republic of Congo, also known as Congo (Brazzaville). A number beginning with +242 06 is a mobile on the MTN/Libertis network.
'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.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +212 is Morocco, and +212 6 is a mobile.
Dialing from the USA, 00 44 would be UK. 00 is the international access code in USA followed by the country code of UK which is 44.
Country code +358 is Finland.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +880 is Bangladesh, and +880 19 is a Banglalink mobile.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +27 is South Africa, and +27 78 is an MTN mobile.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +62 is Indonesia, and +62 819 is an XL Postpaid mobile.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +269 is the Comoros Islands in the Indian Ocean.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +682 is the Cook Islands, but there are no valid numbers beginning +682 0.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +41 is Switzerland, and +41 79 is a mobile.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +256 is Uganda, and +256 78 is a mobile.