Not all countries have phone books online. Often there is only a business directory. Some countries have data protection laws restricting the use of phone number data online.
Many less-developed countries don't have the resources to put a phone book online.
All directories added here are manually checked and reviewed, so it's possible a directory is not added because it contains very little data - or simply doesn't work!
We have a directory of some sort for most of the countries in the world - we've got almost 1,000 links! However if you know of a new directory for us to link to, let us know.