Washington (CNN) -- Parents are finding it more difficult to keep their children's private personal data from being collected by mobile phone apps, according to a new report.

The Federal Trade Commission is urging mobile phone app developers and phone companies to make it easier for parents to control the personal information being collected by smartphone apps. It's the second time this year the agency has looked at the issue.

Since the first report in February, the FTC said it found that almost nothing has been done by developers or phone companies to improve transparency.

Only 16% of apps provided parents with a link to a privacy policy or other disclosure before an app is downloaded, the first survey found. In the follow-up, researchers found similar results, with 20 percent of the apps linking to general disclosure information or a privacy policy, the report said.

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