The company used a "three-point flexural test" which supports the device at two points on either end and then applies force using a high-precision Instron compression test machine. They tested the iPhone 6 and 6 Plus, iPhone 5, LG G3, Samsung Galaxy Note 3, and HTC One (M8).
At first, 10 pounds of force was applied for 30 seconds, then released. They increased the force in 10-pound increments, noting when the phones first started to deform and when they saw the screen come loose from the case.
The iPhone 6 Plus, the more robust of the new iPhones in our testing, started to deform when we reached 90 pounds of force, and came apart with 110 pounds of force. With those numbers, it slightly outperformed the HTC One (which is largely regarded as a sturdy, solid phone), as well as the smaller iPhone 6, yet underperformed some other smart phones. Throughout most of our test, the LG G3 and Samsung Galaxy Note 3 bent, then recovered completely from each step up in force. But at 130 pounds, the case of the G3 fractured. At 150 pounds of force, the Note 3's screen splintered and it stopped working.
Consumer Reports concluded that "While nothing is (evidentally) indestructible, we expect that any of these phones should stand up to typical use."
Take a look at some video and photos of the tests below!