9to5Mac found mentions within the operating system that there would be a second SIM card tray. There are also references to “second SIM status” and a “second SIM tray status”.
In February this year, sources told Bloomberg that the 6.5-inch OLED iPhone model could be offered in a dual-SIM variant for some markets. Two months later, former KGI Securities analyst Ming-Chi Kuo claimed that the 6.1-inch LCD iPhone would also come with dual-SIM support. Kuo believed the dual-SIM iPhone models are catered for consumers who travel often and have to switch between telcos.