Apple says the iPhone X has the most durable glass ever used in a smartphone, with a strengthening layer that is 50 percent deeper, but a series of drop tests show that glass and concrete still don't play well together.

SquareTrade , a company that provides extended warranties for electronic devices, conducted several breakability tests on the iPhone X, and found that its glass back and lack of a home button make it "the most breakable iPhone ever."

Not only did the iPhone X's glass shatter when dropped on its front and back from a height of six feet, but the display also malfunctioned. Keep in mind that pocket height for most people is about three feet.

SquareTrade is naturally using the opportunity to push its two-year smartphone protection plan , which was recently reduced to $129 plus a $99 deductible for most claims, in the United States.

The plan covers cracked screens, liquid damage, battery failure, Lightning connector failure, and speaker failure. It doesn't cover loss or theft.

SquareTrade customers now have an in-home repair option with a lower $25 deductible to fix cracked screens. The service is currently available in more than 700 cities across the United States, with new cities added monthly.

A few YouTube channels also tested the iPhone X in extreme conditions to determine how durable and water resistant the device is.

EverythingApplePro placed the iPhone X in a 20-foot tube of water for 35 minutes without any signs of liquid damage occurring. He also put the iPhone X into a running washing machine, and the device still remained functional.

JerryRigEverything scratched the iPhone X with a utility knife, including the cameras, stainless steel frame, and rear Apple logo. He also tried to bend the device, without much success, and burn the display with a lighter.

While breakability tests are generally unscientific, the videos reveal that even the most durable glass in a smartphone isn't shatterproof.

Apple recently confirmed it will charge out-of-warranty rates of $279 for iPhone X screen repairs, and $549 for any other damage to the device, unless it is a manufacturing defect covered by Apple's standard one-year limited warranty.

There's also AppleCare+, an optional, premium warranty plan that extends an iPhone's warranty coverage to two years from the original purchase date of the device, and adds up to two incidents of accidental damage coverage.

With AppleCare+ for iPhone X, the price of a repair would be the $199 upfront cost of the plan plus a $29 or $99 incidental fee.

If you shatter your iPhone X's screen once, for example, you would pay $279 out of warranty. With the upfront cost of AppleCare+ coupled with the screen repair incidental fee, you would pay $228.

If you shatter your iPhone X's back glass, having AppleCare+ is even more worthwhile. Apple's flat rate is $549 for this type of damage, while the upfront cost of AppleCare+ coupled with a $99 incidental fee totals $298.

All prices above are listed in U.S. dollars. AppleCare+ and Apple's out-of-warranty repair fees vary in other countries.

SquareTrade conducted breakability tests for the iPhone 8 and iPhone 8 Plus a few months ago with similar results. Both of the glass-bodied models shattered on all sides in every single drop test, including front and back drops at a distance of six feet, a 22-foot shot drop test, and a tumble test.