Need some advice

I have AVG protection Pro on my android phone, and have AVG Internet security on my desktop computer at home for windows.
Should I be getting antivirus for my phone, and my PC, included in all in one deal?

Is there a difference between "protection Pro" and "Internet security"?

Doug, For a complete run down on AVG products have a look @ this webpage (http://www.avg.com/ww-en/home-small-office-security#all-tab).
AVG Guru