Android phones subsidized by the US government come with preinstalled adware and a back door for forcing installation of apps.

The adware is in a modified version of an essential system configuration app.

The back door is a surreptitious addition to a program whose stated purpose is to be a universal back door for firmware.

In other words, a program whose raison d'être is malicious has a secret secondary malicious purpose.

All this is in addition to the malware of Android itself.