I recommend the World Telephone Numbering Guide.
You can get a state-by-state listing of telephone area codes in India at the link below.
(see the related links)
There are no telephone city codes in Australia beginning with 1.
Before area codes, telephone areas in North America were defined by reference to the nearest large city.
Telephone country codes are one-, two-, or three-digit codes identifying a country or external territory. For a complete list, see the related links. Some countries have separate codes for mobile phones, but others do not.
The related link provides a list of telephone country codes.
Kiribati is country code +686. There are no city codes or area codes. The local number is 5 digits.
An international telephone number typically consists of a country code, a city code, and a local number, although some countries do not use city codes. A city code is another term for a telephone area code, although area codes are often quoted including a domestic trunk prefix that is always omitted for the city code. Using a city code allows for shorter local numbers, since the same local number can be reused in different city codes in the same country.
The Kingdom of Tonga is country code +676. There are no city codes or area codes. The local number is 6 digits.
The Seychelles use country code +248. There are no city codes or area codes. The local number is 7 digits.
Try the BT website. You can also get a full list from Ofcom, the UK telephone regulatory agency, or from Wikipedia. See the related links.
You have to know what area in the Philippines you want to write to, the best I can do for you is provide the site that gives you all the zip codes for the area your looking for, search the site and find the exact area.Philippines ZIP Codes Directory Complete list of All Postal ZIP codes in the Philippines and Telephone Area Codes list with a detailed Philippine map.http://zip-codes.philsite.net/