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The researchers at Lookout found that several Android wallpaper applications were capable of harvesting the number, subscriber identifier, such as IMSI, and the currently entered voicemail number on the phone.

"While this sort of data collection from a wallpaper application is certainly suspicious, there's no evidence of malicious behavior," said the company in a blog post.

"There have been cases in the past on other mobile platforms where well-intentioned developers are simply over-zealous in their data gathering, without having malicious intent."