Within the Philippines, Manila is area code 02.
From outside the Philippines, the area code is +63 2; +63 is the country code for the Philippines, and then you drop the leading '0' from the domestic area code.
(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.)
All of metro Manila is in area code 02, which is +63 2 in international format.
(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 for the Philippines is +63. The area code for Manila is 02, but you have to drop the leading '0' for international calls, so it becomes +63 2.
The country code and area code of Metro Manila, Philippines is 63, (0)2.
The country code and area code of Palawan, Philippines is 63, (0)48.
The country code and area code of Pangasinan, Philippines is 63, (0)75.
The country code and area code of Bukidnon, Philippines is 63, (0)8851.
The country code and area code of Camarines Sur, Philippines is 63, (0)54.
The country code and area code of Albay, Philippines is 63, (0)52.
The country code and area code of Isabela, Philippines is 63, (0)78.
The country code and area code of Aklan, Philippines is 63, (0)36.
The country code and area code of Damilag, Philippines is 63, (0)8853.
The country code and area code of Macabebe, Philippines is 63, (0)4594.
The country code and area code of Kidapawan, Philippines is 63, (0)6423.
The country code and area code of Tiaong, Philippines is 63, (0)4264.
The country code and area code of Benguet, Philippines is 63, (0)74.
The country code and area code of Mauban, Philippines is 63, (0)4251.
The country code and area code of Maguindanao, Philippines is 63, (0)64.