There will be three versions of the 2018 iPhone X this year, two OLED models and one LCD model and now it looks like some or all of these handsets could come with dual SIM support.
Apple recently released their new iOS 12 beta 5 to developers, the software has also been released to Apple’s public beta testing program. This new beta apparently has references to dual SIM support on the iPhone.
References to a ‘second SIM status’ and ‘second SIM tray status’ have been discovered in the new iOS 12 beta 5. This suggests that at least one of the three new iPhone X handsets will support dual SIM card slots.
We are expecting three models of the 2018 iPhone X in September, a 6.1 inch LCD iPhone X which will be the entry level device that is rumored to cost $700. There will also be two OLED iPhone X handsets one with a 5.8 inch display and the other with a 6.5 inch display.
Source 9 to 5 Mac