Sony Mobile Communications has launched two new Android-based LTE smartphones for the Japanese market; the light-weight Xperia SX and the Xperia GX, which has a 13-megapixel camera, the company said on Wednesday.

The two new products are the first Sony-branded smartphones to launch in Japan, and can download at speeds of up to 75 Mbps over LTE networks, according to Sony. Both are powered by 1.5GHz dual-core processors and will run Android 4.0, also known as Ice Cream Sandwich.

The company has previously announced the LTE-equipped Xperia ion for the U.S. market, which has a 12-megapixel camera. The Xperia GX bests that with its 13-megapixel camera, but a spokesman at Sony didn't want to elaborate on what differences that will lead to in terms of image quality.

The Xperia GX also has an 4.6-inch HD screen and 16GB of internal flash storage.

For users that don't want a big screen, Sony has introduced the Xperia SX. The device has a 3.7-inch screen and weights only 95 grams, making it the world's lightest LTE smartphone.

The Xperia SX also has 8GB of internal flash storage and an 8-megapixel camera.

Both smartphones will start shipping in Japan during the summer, according to Sony. Pricing was not announced. For now, the company doesn't have any plans to start selling the Xperia GX and Xperia SX in other parts of the world, the spokesman said.

Around 250 new LTE user devices have been announced over the past year, industry organization GSA (Global mobile Suppliers Association) said in the beginning of April. In total, 63 manufacturers have announced 347 LTE-enabled user devices, including 64 smartphones and 31 tablets.

Send news tips and comments to mikael_ricknas@idg.com