Apple released the fifth beta of iOS 12 a few days ago. 9to5mac discovered strings in configuration files that reference dual SIM devices. You should expect at least one new iPhone model with two SIM trays.

Apple is said to unveil three new iPhone models in September. In addition to an updated iPhone X, the company should announce a bigger second generation “iPhone X Plus”.

Apple also plans to bring the notch to more devices with a replacement to the iPhone 8. This iPhone will feature a 6.1-inch LCD display with a notch as well as a single camera on the back of the device. It should be as expensive as the iPhone 8 today.

There have been rumors in the past that Apple was looking at selling iPhones with two SIM cards. It was unclear if Apple wanted to put a normal SIM tray and a second e-SIM card like on the Apple Watch.

But according to these configuration files, this model will let you add two physical SIM cards — there are references to “second SIM status” and “second SIM tray status”.

Apple could limit dual SIM support to some models in particular. For instance, it could be limited to the rumored iPhone X Plus, or maybe the high-end OLED models.

Many users don’t need two SIM slots. But it’s an essential feature for some countries. For instance, in India, cell carriers are regional companies. If you travel back and forth between Delhi and Mumbai, you need two SIM cards and two plans.

Frequent travelers could also use a second SIM slot to avoid expensive roaming fees. It’s usually cheaper to buy a local SIM card. By using two SIM cards, you get the best of both worlds because you can still receive two-factor text messages, keep your phone number for iMessage and more.