Do Androids Dream of Electric Sheep By Philip K Dick :-
One of the best science fiction books.
Its not just about technology but deals with ethical questions with regards to Androids. Also touches on spirituality and humanity on the whole, but never gets boring as it maintains sufficient thrill with good pace.
Well divided chapters hold your attention as you dive deeper into the mind of the lead character who questions himself inadvertently makes you question yourself.
The future is so well done in this book, that it doesn't get in your way, and yet you don't question it.
This book was made into a movie called "Blade Runner". I have Director's cut DVD, but I wanted to read the book first.
The author, has written few more sci-fi books, so they are next on my list.