GamerCore
Android Enthusiast
The Honor 5X is one of a few Android devices that actually features dual SIM cards. That means you can potentially place a total of 2 SIM cards in the device, something that is more popular overseas than in the US.
With so many slots on the phone, you may be wondering what goes where and exactly SIM card sizes fit in the device. The slot toward the top (SIM 1), only supports a larger sized micro SIM cards. The slot below (SIM 2), is where you can insert smaller nano sized SIM cards and is also where you'll find the tray for adding a micro SD as well.
Inserting a SIM card is easy, just use either a SIM removal tool or small paper clip and insert it into the tiny hole in one of the slots. Press it hard enough and the tray will pop out, allowing you to place your SIM card inside. That's it. The Honor 5X will figure out the rest, but should you need to mess around with your network settings, hop into the Settings > Wireless & networks (More) > Mobile network.