We do understand that not all smart computer users are computer scientists and do not understand even Android's malicious software, but for health reasons they should avoid infected smartphones that are ready to use.
Google has discovered that some of the cheap smartphones are now loaded with Triada malware. Triada malware would be installed on these Android phones during the supply chain process.
Though this is not the first time you are hearing about malware infecting smartphones most especially through Google play store app, but this in particular is not coming from play store but straight out of the box.