OnePlus 5T User Manual page 17

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Dual SIM Card Tray
The OnePlus 5T is carrier-unlocked out of the box, with dual nano-SIM card
support. With the power to connect to two networks at the same time, you
can use one device for everything. The OnePlus 5T is a true world phone,
with support for 35 network bands worldwide.
Use the SIM Tray Ejector (found in the box) to remove the SIM tray from the
device. Up to two Nano SIM cards fit in the tray.
17 | What's in the Box Device OxygenOS Safety Information