With just three days to go before Galaxy S3 hits the U.S. market, it looks like Samsung is heading for another success story with its latest smartphone. Here are the reasons why Galaxy S3 is certain to succeed in the U.S. despite being under the shadow of the iPhone.

Brand Identity

The Samsung Galaxy S2 sold 28 million units, while the Galaxy line of devices has sold 50 million units. Seven of those are from the five-inch Galaxy Note, and it all means that even before the S3 launches there is a very strong brand that the mainstream and hardcore consumer technology community know.

That's evident in the S3: the phone set record pre-orders in the UK on Vodafone ahead of the June 21 date and the July window for the new enterprise-approved "SAFE" - Samsung Approved for Enterprise - model.

Discounted S3

Samsung is also offering a scheme, called "SAFE2SWITCH," where users can trade in a smartphone for the Galaxy S3 and get up to $300 discounted. Trading in an AT&T 16GB iPhone 4S gets $215, while the Galaxy S2 on the same network knocks off $140. It's important to note prices will alter if there's water damage or a broken screen, among other damages.

However the offer isn't confined to high-end smartphones: old feature phones can be traded in, admittedly for a smaller discount.

Strong Carrier Support

Samsung's Galaxy S3 will be available on AT&T, Verizon, Sprint, T-Mobile and U.S. Cellular - check out this roundup of the deals offered - which control collectively 95 percent of the market. Those carriers are launching the Galaxy S3 simultaneously, aside from U.S. Cellular which launches the S3 in July - an unprecedented event according to the company's marketing chief. Amazon Wireless is offering the phone for $149, cheaper than the $199 iPhone 4S.

SAFE

Samsung's Approved for Enterprise program aims to address concerns the sector has regarding Android, probably down to the open source software. The S3 offers access to 338 policies, significantly more than the previous 95 on the Galaxy S2, while less than the more-than-500 on BlackBerry.

Android 4.0

Finally, the S3 is launching with Android 4.0 behind the company's TouchWiz UI. While Google's I/O may introduce Android 5.0 Jelly Bean, the operating system probably won't be available until later in 2012.