Australia topped the list, followed by the Netherlands, Denmark, Sweden, Norway, New Zealand, Finland, the United States, Iceland and the U.K., the association said.

Noticeably, Korea scored the best in the country's mobile infrastructure as 99 percent of its population are provided with 3G coverage, it said.

More than 3 billion people around the world are connected to the internet, but that still leaves more than 4 billion people offline, excluded from the powerful opportunities for social and economic development that the internet enables, it added.

The GSMA is a global association of nearly 800 mobile operators in more than 220 countries. The report said the index measures the performance of 134 countries, accounting for more than 95 percent of the world's population. (Yonhap)