Inquiry for Avast Internet Security 3PC, 2YR Plan

Avast Free Antivirus / Premium Security
1

I have 3 PCs and 2 Mobiles.
When it says a 3 PC Plan, do mobile phones under the account count as 1 device?
If so, how can I remove the count if I want to add a PC?

Also, how do I add the 2nd PC to the account?
Do I go to the main website and choose trial for internet security? (That’s not a lesser version, is it?)
And activation, is it the same thing as the mobile app? (Like entering account name and pass, can I use a key file of some sort as an alternative)?

Thanks in advance.

2

PC’s and mobile have different licenses.
If you buy a 3 PC license, it means you can use it on 3 PC’s.
Hence why it says PC license.

If you buy the 3 PC license, just install avast and provide each system with the license.
It is the same as with 1 PC, only now the license can be used on 3 PC’s.