Realme C25Y mobile was launched on 16th September 2021. The phone comes with a 6.50-inch touchscreen display with a resolution of 720x1600 pixels and an aspect ratio of 20:9. Realme C25Y is powered by a 1.8GHz octa-core Unisoc T610 processor that features 2 cores clocked at 1.8GHz and 6 cores clocked at 1.8GHz. It comes with 4GB of RAM. The Realme C25Y runs Android 11 and is powered by a 5000mAh battery. The Realme C25Y supports proprietary fast charging.

As far as the cameras are concerned, the Realme C25Y on the rear packs a triple camera setup featuring a 50-megapixel primary camera with an f/1.8 aperture; a 2-megapixel camera with an f/2.4 aperture, and a 2-megapixel camera with an f/2.4 aperture. The rear camera setup has phase detection autofocus. It has a single front camera setup for selfies, featuring an 8-megapixel sensor with an f/2.0 aperture.

The Realme C25Y runs Realme R Edition is based on Android 11 and packs 64GB of inbuilt storage that can be expanded via microSD card (up to 256GB) with a dedicated slot. The Realme C25Y is a dual-SIM (GSM and GSM) mobile that accepts Nano-SIM and Nano-SIM cards. The Realme C25Y measures 164.50 x 76.00 x 9.10mm (height x width x thickness) and weighs 200.00 grams. It was launched in Glacier Blue and Metal Grey colours.

Connectivity options on the Realme C25Y include Wi-Fi 802.11 b/g/n, GPS, Bluetooth v5.00, Micro-USB, 3G, and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include accelerometer, ambient light sensor, compass/ magnetometer, proximity sensor, and fingerprint sensor.