The flagship phones launched by Samsung and Sony at Mobile World Congress could both be facing delays, according to reports.

South Korean news publication ETNews said that Samsung’s Galaxy S5 (pictured), due to be available in shops on 11 April, may be delayed due to issues with its camera.

The publication suggests Samsung is unable to manufacture a 16 megapixel camera module thin enough to fit into the S5’s casing, meaning the device has not yet gone into mass production.

The new camera module has an extra element compared to the camera on board the Galaxy S4, the S5’s predecessor. In order to solve the problem, thinner lenses will be needed, requiring more accurate moulding technology.

Sony, meanwhile, stopped accepting pre-orders for its new flagship smartphone, the Xperia Z2, prompting speculation that the company could delay its launch.

Promotional banners for pre-ordering the Z2 have been removed from official Sony websites in all regions, although the device is still listed.

According to Xperia Blog, this hasn’t previously happened for a Sony device that has been made available for pre-order.