The mobile video games market is increasing, compared with markets for consoles and handheld video games, while online games are growing faster than the mobile video games, research firm Understanding & Solutions said.

“Global revenues from mobile gaming are pegged at $3.6 billion this year. We predict this figure to rise to $6 billion by 2011," said David Rouse, an analyst at Understanding & Solutions.

The company also pointed out that there is a growing trend in subscription-based and ad-funded mobile games. “An increasing number of games let players buy additional levels or virtual goods using microtransactions,” Rouse said.

Pay per download is still the main revenue source for mobile game publishers and distributors, eMarketer reported.