The Honor 9 Lite supports Hybrid Dual SIM (Nano-SIM, dual stand-by). This means that you can use two SIM cards in the phone at the same time, but only one of them can be used for data. The other SIM card can be used for voice calls and text messages. This is a great feature for people who travel frequently or who have two phone numbers (for work and personal use, for example). It's also helpful if you want to keep your data usage low, as you can use the second SIM card for data when you need it and then switch back to the first SIM card when you're done.