This document provides an overview of telephone and internet coverage around the world based on data from various sources. It finds that:
- For the European Union and United States, coverage data comes from robust surveys like Eurobarometer and US government sources, providing reliable estimates of penetration levels.
- For some other countries, estimates come from the Google Connected Consumer Survey, but these data have limitations as they relate to indeterminate populations and mobile phones only.
- Overall, telephone coverage looks adequate in most countries, while internet coverage is approaching universal levels in many markets but still faces issues that require more work.
- The document aims to help researchers design better international studies by understanding coverage levels and the optimal research