Optus is allowing customers on any mobile network to access its National Geographic app on a 30-day trial.

Originally launched in July as an exclusive for Optus customers, the app contains a collection of videos, movies, articles and photos from National Geographic, including Morgan Freeman's The Story of Us, a documentary series about the common themes that link all of humanity; and The Long Road Home, a miniseries about the frontlines of the Iraq War.

Optus Managing Director of Marketing and Product, Ben White, said “The App has been very popular with Optus customers, with more than 4 million screen views since its launch. So far Australians are engaging across a broad range of content, personalised for them and refreshed every day across a wide range of topics, including animals, history and science."

The app is available for download from the App Store and Google Play.