Claims in-app purchases will overtake paid download fees.
Juniper Research claims that mobile games revenues will increase from $6 billion in 2009 to $11 billion by 2015.
The company's latest report also predict that by 2013, the biggest source of revenues for mobile games firms will be in-app payments rather than one-off download fees.
However, Juniper warns that discovery remains a challenge for the mobile games industry, especially on app stores where there are tens of thousands of games jostling for attention.
"Discoverability can be a chicken and egg problem: high downloads lead to prominence, but achieving a high number of downloads is largely dependent on already being prominent," says author Daniel Ashdown.
"Consequently, a small minority of games achieve very high downloads, whilst the vast majority achieve very small download figures."
Juniper has released a mobile games white paper, which is available here.
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