I’m considering purchasing Kaspersky Internet Security for 3 devices, one of which will be an Android phone. I have installed the trial version on the 3 devices. If or when I purchase a license for 3 devices for one year, will the Android phone be covered under the same single license?

hello @anabrin06 yes 

just enter your license number or using “MyKaspersky account”.

https://support.kaspersky.com/10186#block2

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@anabrin06, license for three devices means any combination of three Windows, Mac or Android devices.

@andrew75  So I can buy the license for 3 devices and use it on 3 Windows PCs, right? Does it have to be a combination of Windows and Androids?

1. Yes.
2. No.