Android-

[Pasca]

How do you say that android is open source??

 

[Pasca]

How can it be customized by the user easily???

 

[Slug]

Hi, and welcome!

How do you say that android is open source??

I'm not sure what you mean here, sorry. What is it you wish to know?

How can it be customized by the user easily???

That can depend on the device, so if you let us know which Android device(s) you're interested in we can offer more accurate advice.