organisers say.The move aims to help the Pope connect with his technology-loving audience.
Digital prayer walls will also be set up and a web-based social networking site established, organisers say.
The co-ordinating bishop, Anthony Fisher, said that the event would be "the most innovative World Youth Day to date".
"We wanted to make WYD08 a unique experience by using new ways to connect with today's tech-savvy youth," he said in a statement.
Attendees would receive daily inspirational text messages and religious teaching would be broadcast on the web, he said.
The six-day event will be held in Sydney in mid-July.
It expected to attract more than 200,000 young Catholics to the Australian city.