Samsung Electronics Corp. (005930:KS) officials announced this week that sales for the Galaxy S3 “flagship” handset have reached 20 million in little over three months since its release.

The Galaxy S3, a phone whose specifications include a large HD (high-definition) screen and 4G LTE (long-term evolution) where the standard is available, had gone through several manufacturing and supply issues before it was released internationally May 29.

American consumers only got their chance to experience the Galaxy S3 in June and July due to the same type of issues, but despite all the challenges, Samsung has sold more units of the device than initially forecasted. European customers were especially instrumental in helping the South Korean consumer electronics firm reach its goal of 10 million units sold in July.

Samsung has, for all intents and purposes, succeeded in its goal of selling as many units as possible before the release of other competing devices. Some of the Q4 2012 releases expected include the Apple, Inc. (NASDAQ:AAPL) iPhone 5, a series of phones powered by the Microsoft, Corp. (NASDAQ:MSFT) Windows Phone 8 OS (operating system) and Motorola Mobility’s new line of Droid RAZR smartphones.

Analysts expect about 6 to 10 million new iPhones to be sold in its first week following the rumored September 21 release date.

Some of the Galaxy S3’s other specifications include Android 4.0, also known as Ice Cream Sandwich, a 1.5 gigahertz Exynos quad-core processor for international users (dual-core for American users), an 8-megapixel rear-facing camera and a 2,100 mAh battery.

The Galaxy S3’s Super AMOLED HD screen measures an impressive 4.8 inches, one of the largest in the market.