App analytics firm SourceDNA just discovered evidence that hundreds of apps in the iOS App Store are collecting a whole bunch of identifying data about you in violation of Apple’s privacy policy. The apps are all using the Chinese advertising SDK Youmi, which was pulling data from private APIs unbeknownst to Apple.

Youmi’s code calls the list of all the apps you have installed on your phone, the email associated with your Apple ID, the serial numbers of the peripherals inside your device, and if you’re running an older version of iOS, the SDK can call the platform serial number of your device.

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