Hi... I am a absolute newbie to Android as I just bought an Android phone and an Android tablet last week. The first thing that threw me is that the phone has Android 2.X and the tablet has version 4.1. Is this like Windows XP and Windows 7?? Can all Android systems be "upgraded" to run the latest version or do you have to stick with what is installed. The second question is will I run into apps that run on one but not the other because of the operating system? I have already run into apps that will not run because of hardware...the tablet does not run Google Play but the phone does. I am a tinkerer and I love to experiment so I hope to be a good member of this forum. Thanks for any advice.