Apple is set to commence mass production of the so-called “iPhone 6” next month, with the possibility of launching the next-generation smartphone’s two models simultaneously.

The iPhone 6 has been widely rumored to come in two sizes, one with a 4.7-inch screen and another with a 5.5-inch display, with the latter likely to be released in the months following the launch of the former.

However, Bloomberg, citing “people familiar with the plans,” reports that the two models may be launched at the same time in September, as Apple prepares to start production in July:

Apple is ramping up on two bigger-screen iPhones, said the people, who asked not to be identified because the plans are private. One model will have a 4.7-inch screen that may be available to ship to retailers around September, said two of the people. A larger 5.5-inch version is also being prepared for manufacturing and may be available at the same time, the people said.

Production of the 5.5-inch model is expected to be more complicated than the 4.7-inch one. As a result, the bigger model’s stock may be lower than the smaller model’s come launch day.

In response to expected high demand for the iPhone 6, two of Apple’s key suppliers in Taiwan have gone on hiring sprees for additional employees to help assemble the device. Foxconn is reportedly recruiting more than 100,000 workers, while Pegatron is said to be expanding its workforce in one of its factories by 30 percent.

Foxconn and Pegatron are said to handle 70 percent and 30 percent, respectively, of the iPhone 6′s production.

See also: New Leaked Photos Show Display Measurement Of Apple’s 5.5-Inch “iPhone 6,” A New Report Says The “iPhone 6″ Might Include A Barometer, and Apple’s 5.5-Inch iPhone 6 Compared With Samsung Galaxy Note 3 In New Video.