The Samsung Galaxy S6 and Galaxy S6 Edge are available as of Friday and many carriers and retailers are offering the device on contract, but customers can also purchase the Galaxy S6 and Galaxy S6 Edge unlocked.

Unlocked devices are compatible with GSM networks, which are the standard overseas; however, some U.S. networks, including AT&T and T-Mobile, also run on GSM frequency bands. GSM-compatible phones can easily interchange SIM cards to run on different GSM-based mobile networks. Unlocked devices are typically sold at full retail price.

Here’s a rundown of sellers offering the Samsung Galaxy S6 unlocked.

Amazon

Sellers are offering the Galaxy S6 on Amazon for between $849.99 and $1,139.00 and the Galaxy S6 Edge for between $1,105.00 and $1,335.00. Black, white and gold color options are available.

eBay

Sellers are offering the unlocked Galaxy S6 on eBay for between $699.99 and $849.99 and the unlocked Galaxy S6 Edge for between $799.99 and $1,350.00. Some sellers are offering the Galaxy S6 for $699.99 as a launch day discount. Black and white, gold and blue color options are available.

GSM Nation

GSM Nation is offering the 32GB unlocked Galaxy S6 for $699 and the 32GB unlocked Galaxy S6 Edge for $749. Currently, only the black models are available for purchase.

Expansys

Expansys.com is offering the 32GB unlocked Galaxy S6 for $949.99. Black and white, gold and blue color options are available. Pricing information for the unlocked Galaxy S6 Edge is not yet listed.

Overstock

Overstock.com is offering the 32GB unlocked Galaxy S6 for $964.99. Only the black color option is available.

Newegg

Newegg.com is offering the 32GB unlocked Galaxy S6 for $999.99. Black, white and gold color options are available.

K-Mart

K-Mart.com is offering the 32GB unlocked Galaxy S6 for $999.99. Only the black color option is available.

Others

Best Buy has not announced availability for its unlocked Galaxy S6 or Galaxy S6 Edge. Target is offering the unlocked Galaxy S6 and Galaxy S6 Edge in stores only. Customers must go to a retail location to find out pricing information.

About the Samsung Galaxy S6 and Galaxy S6 Edge

The Samsung Galaxy S6 and Galaxy S6 Edge include a 5.1-inch Quad HD (2560 × 1440 resolution) display; an Exynos 7420 chip; 3GB of RAM memory and 32GB, 64GB and 128GB internal storage options; and a 16-megapixel rear camera with optical image stabilization and 5-megapixel front camera with real time HDR and respective 2,550mAh and 2,600mAh batteries.

The devices run Android 5.0 Lollipop, which includes a cleaner TouchWiz user interface. The UI features simple colors that are associated with different applications. Pages for the phone app are highlighted in green, pages for the video app are highlighted in purple, and pages for the contacts app are highlighted in orange.

Samsung also introduced its Samsung Pay system to rival Apple Pay and other NFC-based payment systems. The system, developed by Samsung new subsidiary Loop Pay, is compatible with the magnetic strips on credit cards as well as with NFC-based payment systems, making it automatically accepted at most retailers. Apple Pay is accepted only at retailers that have NFC hardware, which is about 10 percent of all retailers.

The Galaxy S6 and Galaxy S6 Edge both feature a fast-charging technology that allows the devices to gain five hours of battery life in a 10-minute charge. The devices can also charge from zero to 100 in half the time of an iPhone 6, Samsung claims.

The Galaxy S6 and Galaxy S6 Edge also include built-in wireless charging technology, meaning there is no need for extra accessories to enable wireless charging, such as special cases or charging pads. The technology is compatible with the two top wireless charging standards -- Wireless Power Consortium and Power Matters Alliance -- so users will be able to charge their devices wherever a charging pad is available, such as cafés, restaurants and offices.