Apple Ihas responded to complaints about bending iPhones, hours after withdrawing the problematic v8.01 software update. "With normal use, a bend in iPhone is extremely rare and through our first six days of sale, a total of nine customers have contacted Apple with a bent iPhone 6 Plus," Apple spokeswoman Trudy Muller said.

The "bendgate" is in full progress as the new iPhones seems to be bend when placed in back pockets, with most comments coming on social media and online forums.

Apple said its iPhones feature stainless steel and titanium inserts to reinforce high-stress locations and use the strongest glass in the smartphone industry.

Apple was also forced to withdraw a faulty update to its latest operating system after some users of its new phones complained of call service disruptions. The company is working on an iOS update to fix the issue, and will release it in the next few days.

On Thursday, Apple also issued a step-by-step guide for users to reinstall iOS 8, launched last week, through the latest version of iTunes.