Samsung had to keep its Galaxy S3 smartphone as secret as the Apple iPhone it challenges, according to a new blog splashing the secrets on the new Android phone’s many prototypes.

In the Samsung Tomorrow blog it’s revealed that the engineers worked on multiple prototypes of the Galaxy S3 to “avoid any design leaks”.

Samsung Galaxy S3 review

Samsung Galaxy S3 video review

The Galaxy S3 – which features a 4.8-inch super AMOLED screen (with a resolution of 1,280 by 720 pixels), a quad-core processor, 1GB of RAM, and an 8Mp camera – was launched in May.

Each of the three S III prototypes were made like final products, and “continuously changing” to keep things top secret. Engineers had to repeat the same process for all three types, the Samsung blog reveals.

“I was in charge of the antenna,” said Senior Engineer BeoungSun Lee (H/W R&D).

“Generally, we manufacture the antenna based on the final design and request for authorization. However, for security reasons, we had to make the antenna over and over.

“We had to come up with a new antenna every time the new design came out. To be honest, it was quite tiring and frustrating”.

WooSun Yoon(Principal Engineer, H/W R&D) agreed. “There were many prototypes and yes, it takes more time and effort to make more working prototypes.

“It’s even more difficult when you’re sending those to different places for testing and yet at the same time hiding it from everyone. Time constraints pushed me to take a lot of helicopter rides back and forth.

“I’m glad we were able to keep the new Galaxy S III under wraps to the end, but I can’t stress enough how hard it was.”

Principal Engineer WooSun Yoon (H/W R&D) also told how disguises were used.

“We had to make three types of the Galaxy S3 to prevent the design from leaking.

Samsung galaxy S3

“And on top of that, whenever any of these had to go out for testing, we put them inside ‘dummy boxes’, which are cases that hide the design of the device, to disguise it.

“Even if people, inside or out of the campus, saw the device, I doubt they would have known what it was.”

More and more Samsung Galaxy S3 secrets are sneaking out now that the smartphone is on sale. The Wordpress blog Inside Sprint Now last week leaked 15 Samsung Galaxy S III training videos.

The new Android smartphone was launched in May in the UK. Samsung said earlier this month that the Galaxy S III will be available in the US starting this month from five carriers, including AT&T, Sprint, T-Mobile, Verizon Wireless and US Cellular.