The company is also expected to release two OLED models.
"The 6.1-inch LCD model will likely sport a metal back [like older iPhone handsets] that will come in several colors", said the source, adding that the two OLED handsets will come in two sizes: one either 6.2 or 6.3 inches long, and the other 5.8 inches. More importantly, OLED panels can be molded into curved screens and possibly made foldable. Kuo, however, stated that all three 2018 models would debut with full-screen, edge-to-edge displays and the TrueDepth camera system that's now featured on the 10th anniversary iPhone.
All three handsets sport glass backs with either aluminum or stainless steel frames.
It's believed that Apple may have reservations about producing just OLED iPhones as Samsung is the only manufacturer capable of supplying its needs. Kuo also suggests that this model will feature a 6.1-inch TFT LCD screen.
The same source revealed that Pegatron subsidiary Casetek could become the supplier of the metal backs for the 6.1-inch iPhone units.
A different source disclosed that Casetek is already trying out new casings for the LCD model in hopes that it would be chosen to supply the back case for the 6.1-inch iPhone. Pegatron is now the assembler of the iPhone 8, so both Casetek and Pegatron are hoping that Apple would ask them to integrate the services they offer for iPhone orders in 2018. Foxconn has monopolized iPhone X orders this year, while Pegatron makes the iPhone 8.
Foxconn and its smaller Taiwanese rival Wistron split production of the iPhone 8 Plus.
Another source familiar with the situation said Casetek has been experimenting with new casings for the LCD-equipped iPhone.
Apple, Pegatron and Casetek all declined to comment.