Does the Xiaomi Poco C75 support carrier aggregation for better 4G speeds?
No official confirmation, but the Mediatek Helio G81 Ultra typically supports basic 4G LTE without advanced carrier aggregation.

Is the Poco C75’s 120Hz refresh rate adaptive, or does it stay fixed at 120Hz?
The IPS LCD panel likely has a fixed 120Hz mode, meaning it won't dynamically switch to lower refresh rates to save battery.

Can I expand storage and use dual SIM at the same time?
It depends on the slot configuration. If it's a hybrid SIM slot, you have to choose between dual SIM or microSDXC storage expansion.

How does the Mediatek Helio G81 Ultra compare to the Helio G85?
The Helio G81 Ultra is a minor revision of the G85, with similar 2x Cortex-A75 & 6x Cortex-A55 cores but possibly slightly better efficiency.

Does the Poco C75 support Widevine L1 for HD streaming on Netflix and Prime Video?
Unknown, but most budget Xiaomi/Poco phones come with Widevine L3, meaning they can only stream in SD resolution on Netflix.

Does the phone come with a charger in the box?
No, the box contents mention only a USB A to C cable, meaning you’ll need to buy a separate 18W charger.

Is the "Auxiliary lens" in the camera setup useful?
Most likely a depth sensor or AI-assisted lens that doesn’t add much value to actual photography.

Does the Poco C75 have an IR Blaster for remote control features?
No, this model does not include an infrared (IR) blaster, unlike some other Xiaomi/Poco devices.