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Sony is expected to unveil two new smartphones, alongside other gadgets at the MWC 2016 event. Reuters/Yuya Shino

The Xperia Z3+ is Sony's flagship for 2015. In the last week, Sony began rolling out the Xperia Z3+ across the globe, although the company does not appear to have any official plan to release it in the U.S. However, Amazon has started selling the unlocked Xperia Z3+ for $650.

Sony is selling the Verizon-powered Sony Xperia Z4V exclusively to customers in the United States, but now the Xperia Z3+ is also available on Amazon for the U.S customers. The retailer giant is also selling the dual SIM version of the handset with an additional cost of $10 to $20.

Phone Arena claims that the unlocked GSM model available with Amazon is compatible with AT&T and T-Mobile LTE networks. However, the handset does not support other U.S. carriers such as Verizon or Sprint. Amazon is selling the Xperia Z3+ in all four color variants: black, white, copper and aqua-green.

In the United Kingdom, the Sony Mobile Store is selling the Xperia Z3+ for £499 with all the color options. The Sony Xperia Z3+ is an upgraded version of the Xperia Z3 flagship from 2014.

The newer model is packed with a powerful Snapdragon 810 chipset, but early buyers have reported that they are experiencing overheating issues on their device. Sony is aware of the overheating problem and has promised Xperia Z3+ owners that it will be releasing a repaired version.

The Sony Xperia Z3+ comes with a 5.2-inch display that supports full HD resolution of 1080 x 1920 pixels. Its chassis is resistant to dust and water. The octa-processor is supported by 3 GB of RAM.

The rear camera present on the device is of 20.7-megapixel along with LED flash. There is a 5-megapixel forward-facing camera unit. The internal storage available on the device is 32 GB, and the phone supports up to 128 GB of microSD on its external storage. It is equipped with a 2930 mAh capacity battery.