2019 will be a horrible year for virii (computer viruses).
Polymorphic Viruses will hit iPhone (ios) and Android pretty hard. The Russians and Chinese are deploying thousands of new viruses each year.
A virus does not necessarily have to install itself on the device anymore. According to an FBI report, the latest Russian virus embeds itself into the edge router device of your home. This polymorphic virus (Russian VPNFilter) can then steal data from any device connected.
I HIGHLY recommend all computer and smartphone users to download Malwayrebytes.
Click here to get Malwarebytes. Malwarebytes can be installed even if you already have antivirus protection.
You can find more information at the FBI Information Security Center.