OnePlus

This is the Tmobile USA A6013 Unlocked Model and is Single SIM.
Compatible with Verizon, Tmobile, AT&T and all GSM Networks. Will not work with Sprint. Please verify with your network to ensure full compatibility.
Operating System: OxygenOS based on Android 9 (Pie), CPU: Qualcomm Snapdragon 845 (Octa-core, 10nm, up to 2.8GHz), 8GB Memory + 128GB Storage, Sensors: In-Display Fingerprint Sensor.

6.44 inches, Fluid AMOLED, 90Hz, HDR10+, 1080 x 2400 pixels, Corning Gorilla Glass 5
Android 10, OxygenOS 10.5.9, Qualcomm SDM765 Snapdragon 765G (7 nm), Octa-core (1×2.4 GHz Kryo 475 Prime & 1×2.2 GHz Kryo 475 Gold & 6×1.8 GHz Kryo 475 Silver), Adreno 620
256GB Storage, 12GB RAM, No Card slot