"On the whole, the sales have been pretty good, especially on eBay and with third-party retailers," he said. "The demand has exceeded supply, but we also purposely did not want this first generation product to have a large scale."
ZTE's next Firefox phone will arrive in the first half of 2014. It will come with a dual-core processor, a bigger screen, and a revamped user experience,
In October, ZTE will also begin selling its Grand S and Nubia phones in the U.S. through retailers.
Available already in China, the Grand S is an Android phone with a 5-inch full-HD screen. It has a quad-core processor, 13-megapixel camera, and its U.S. edition will probably come with a 2300 mAh battery. The price will range between US$400 and $500 (without subsidies.)