For those who don't know anything about this phone it is basically a budget OnePlus 7 Pro.
I actually bought this phone, from this seller and I'm using to post this.
Here's the description from the AliExpress listing:
CPU ---------- Snapdragon 855 Octa Core up to 2.84GHz
Screen ------- 6.39-inch,AMOLED screen , 2340x1080 FHD+
OS ------------ MIUI 10
Fingerprint----7th Generation InscreenD Fingerprint
RAM+ROM --6GB RAM+128GB ROM
Camera ------48MP+8MP+13MP Triple Rear Camera, 20MP Pop-Up Front Camera
Battery ------ 4000mAh(typ)/3900mAh(min) / support 27W QC 4.0
Attention ---- Global Version, Support Multi-Language,Google Play,Google Pay
Network --- Dual SIM Dual Standby (Nano SIM Card + Nano SIM Card)
Please visit this website to check it frequencycheck.com
2G: B2 / B3 / B5 / B8
3G: WCDMA B1 / B2 / B5 / B8
4G: FDD LTE B1 /B2 /B3 /B4 /B5 /B7 /B8 /B20 /B28