Nearly 8.8 million UK mobile owners used an app that connected to the Internet during April 2011, reveals a study by the GSMA and comScore in partnership with the UK mobile operators.

The data from the GSMA Mobile Media Metrics (MMM) application key measurements report said that Google Maps was the most accessed app with 6.4 million unique users.

The application key measurement report includes hundreds of app titles and provides a ranking of the most popular connected applications in the UK.

The report found that in April 2011, 40% of the 21.8 million UK mobile Internet users accessed a connected application and that Google Maps reached 73.3% of all UK app users.

Yahoo’s Weather app ranked second with 3.6 million. Facebook’s app with 3.5 million unique visitors came next. Another two apps published by Google – Google Mobile and YouTube – completed the top five.

Apple iOS leads the OS market with 65% connected via a device running on Apple iOS. In April 2011, Google’s Android OS had the second highest share among operating systems for application usage at 31%, said the report. Symbian ranked third with just 1% of connected app users.

GSMA media director Henry Stevens said Apps have become an important entry point for accessing content on mobile devices and their usage will only increase with the rapid proliferation of smartphones.

Stevens said, "We look forward to delivering to the UK market these critical insights to help understand the mobile ecosystem."