A California man has filed a class-action lawsuit against Apple after his daughter dropped his iPhone 4 and cracked its glass casing.

Los Angeles resident Donald LeBuhn alleges in the lawsuit that Apple knew about design flaws in the glass housing of its newest smartphone, but still went ahead with the shipments. It also accuses Apple of failing to warn its users that 'normal' usage of the phone could damage it.

The lawsuit states that LeBuhn paid over $250 in September last year for a brand new iPhone 4, which broke after his daughter dropped the device from a height of around three feet while sending a text message.

Apple's claims that the iPhone 4's glass is "20 times stiffer and 30 times harder than plastic" and made from the same glass used in helicopters and super-fast trains, have been also been challenged in the suit, Apple Insider reports.

“Months after selling millions of iPhone 4s, Apple has failed to warn and continues to sell this product with no warning to customers that the glass housing is defective,” the lawsuit read.

But we reckon, instead of choosing to go through all the hassle of a lawsuit, he should have just booked an appointment with his nearest 'Genius Bar' and took advantage of Apple's "good old fashioned customer service".