Screenshot by Claire Reilly/CNET

It's been on shelves for a matter of days, but some iPhone 6 and iPhone 6 Plus users are complaining of a major design flaw that sees the smartphone body bend under pressure.

Photos have begun appearing online showing distinctly bent aluminium devices, with complaints that the new iterations of the iPhone, which feature a thinner and larger aluminium body, are unable to stand up to the wear and tear of staying in a pocket.

Apple users have taken to the MacRumors forum to complain about the design flaw, which seems to affect the device at the top end near the volume buttons. One user, hanzoh, posted an image of a bent iPhone 6 Plus, complaining that the device warped after roughly 18 hours in his pocket.

The iPhone 6 Could Bend In Your Pocket… !! haha.. love u APPLE pic.twitter.com/MJV2s5kT1a — Nelson Cardoz (@nelsoncardoz) September 23, 2014

This post was followed by similar images from other forum users complaining of the same problem, and Twitter has since lit up with talk of "bend-gate" and pictures of unintentionally curved iPhones. One dedicated iPhone 6 Plus owner even posted a video showing how quickly the device could be bent when pressure was applied.

Cult of Mac reports the issue is not a new one, saying that similar problems emerged after the launches of the iPhone 5S, iPhone 5 and iPhone 4S. The site has also posted images of bent chassis from Samsung, Sony, HTC, BlackBerry and Oppo.

Update at 12:30 p.m. AEST: Apple has declined to comment.