Yes.You could, but you'll have to pay.
NO
You can change the battery of a 10in Samsung Galaxy Tab 3.
You cannot turn on and off lights for Samsung tab 3 7.0 because it does not have the soft lights buttons.
Yes if you have wifi at home on the Galaxy Tab 3
Samsung Galaxy Tab was created in 2010.
Samsung galaxy tab is cheap but then also it has good feature than ipad 2
Yes
Yes it is. Its OS is Jelly Bean 4.1
There are various versions of Samsung Galaxy tablets, so it would be difficult to compare. There's the Samsung Galaxy Tab (7.0, 7.7, 8.9, 10.1), Tab 2 (7.0, 10.1), and Tab 3 (7.0, 8.0, 10.1), and the Samsung Galaxy Note (8.0, 10.1, 10.1 2014 Edition).
it is not because samsung galaxy 3 is like a size of a small tab and it way to big to put in your pocket
Not by default, but there's probably an app for it.
The original Samsung Galaxy Tab is not directly in competition with the iPad; it's a smaller tablet meant to fill the niche between smartphones and the standard 10.1" tablet. The Samsung Galaxy Tab 10.1 is an Android tablet running Android 3.x Honeycomb. It is an excellent alternative to an iPad, depending on your preferences. In short, it's not about which is better, it's about what you prefer and what you're going to use it for.