CNET's Galaxy S4 e-book guide (and a giveaway spectacular!)

Editor's note: This contest is now closed.

The world's fastest-selling Android phone just got a little savvier. CNET How To is bringing its very best, unpublished advice to our newest e-book, "Mastering the Galaxy S4."

New to Android? We've got you. Google maven? You'll find plenty of hidden tips here, too. We've tapped through every last feature, button, sensor, shortcut, and blaster (seriously) to bring you the tips and tricks that help you master your S4.

CNET brought you a guidebook before, but for the S4, we've kicked it up a notch.

The e-book features hundreds of tips, from setting up your phone and kicking out the bloatware to customizing the interface, using Samsung's exclusive features, and even rooting the device.

Starting on June 24, you'll be able to purchase Mastering the Galaxy S4 from the Amazon Kindle Store to read on any of your devices.

To celebrate the occasion, we're treating you Galaxy S4 owners (or soon-to-be owners) with an exclusive giveaway. One lucky winner will win seven of the best S4 accessories, including the just-released wireless charging system, an S-View cover, and even the Smart Dock.

The winner and five runners-up will also be one of the first to own "Mastering the Galaxy S4."

Interested in winning one of these great prizes? Here are the rules:

• Register as a CNET user. Go to the Join the Conversation section below this blog post and hit the Add Your Comment button. If you're not already registered, please do so. If you're already registered, there's no need to register again -- you just need to be logged in.
• Leave a comment below -- tell us what your favorite feature of the Samsung Galaxy S4 is.
• Leave only one comment. You may enter for this specific giveaway only once. If you enter more than one comment, you will be automatically disqualified.
• There will be six (6) winners chosen randomly -- one grand-prize winner and five first-prize winners. The grand-prize winner will be awarded a prize of one (1) Galaxy S 4 S-View Flip Cover; one (1) Wireless Charging Pad; one (1) Galaxy S 4 Spare Battery Charging System; one (1) TecTile Programmable NFC Tags; one (1) Smart Dock Multimedia Hub; one (1) MHL HDTV Smart Adapter; one (1) Wireless Charging Cover; and (1) Mastering the Kindle Samsung Galaxy S4 e-book. The five first-prize winners will be awarded a prize of one (1) Mastering the Samsung Galaxy S4 e-book.
• If you are chosen, you will be notified via e-mail. The winner must respond within three days of the end of the sweepstakes. If you do not respond within that period, another winner will be chosen.
• Entries can be submitted until Sunday, June 23, at 11:59 p.m. PST.
• Thanks for entering the sweepstakes, and good luck!

Some legalese:

* NO PURCHASE NECESSARY TO ENTER OR WIN. A PURCHASE WILL NOT INCREASE YOUR CHANCES OF WINNING. YOU HAVE NOT YET WON. MUST BE LEGAL RESIDENT OF ONE OF THE UNITED STATES OR CANADA (EXCLUDING QUEBEC), 18 YEARS OLD OR AGE OF MAJORITY, WHICHEVER IS OLDER IN YOUR STATE OF RESIDENCE AT DATE OF ENTRY INTO SWEEPSTAKES. VOID IN PUERTO RICO, ALL U.S. TERRITORIES AND POSSESSIONS AND WHERE PROHIBITED BY LAW. SWEEPSTAKES ENDS 06/23/13. SEE RULES FOR DETAILS.