The Nokia Lumia 638, a dual-SIM varient of the Nokia Lumia 630, is available for pre-order on Shanxi Mobile. The phone is available for ¥1,199 ($192). The phones will operate on China Mobile, of which Shanxi Mobile is a subsidiary.
Unlike the Lumia 630, the Lumia 638 supports 4G/LTE, like the Nokia Lumia 635. The 638 also has double the RAM of either device, sporting 1GB instead of 512MB. The phone runs WIndows Phone 8.1, with a 1.2GHz quad-core Snapdragon 400 processor, and appears to have the same 4.5-inch screen as the 630 and 635.
Chinese customers can pre-order the device right now.