Each phone brings something the other lacks, making this a genuine trade-off rather than a one-sided result. The Redmi 15 4G gains the edge in wireless connectivity with NFC support — enabling contactless payments and quick device pairing — while the Color 6 has no NFC at all. The Redmi also pulls ahead on cellular throughput, with a download speed of 390 Mbits/s versus 300 Mbits/s on the Color 6, and upload at 150 Mbits/s versus 100 Mbits/s. For users who regularly transfer large files or stream in bandwidth-heavy environments, that faster ceiling is a practical advantage. The Redmi 15 4G also includes a compass, which the Color 6 lacks — a useful addition for navigation apps that rely on directional orientation.
The Color 6 counters with a meaningful hardware inclusion of its own: a microSD card slot for expandable storage. The Redmi 15 4G omits this entirely, meaning users are locked into whatever internal storage they purchase. For those who shoot lots of video, store large media libraries, or simply want the flexibility to expand cheaply, this is a tangible limitation on the Redmi's side. Everything else — Wi-Fi 5, Bluetooth 5, dual SIM, USB-C, fingerprint scanner, GPS with Galileo, and accelerometer — is identical on both devices.
This category is closely contested, but the Redmi 15 4G holds a slight overall edge: NFC is an increasingly essential feature for mobile payments and tap-to-connect workflows, and its faster cellular speeds add real-world value. The Color 6's expandable storage is a meaningful counterpoint, but it appeals to a narrower use case. Users who prioritize payments and connectivity speed will lean toward the Redmi; those who need flexible, affordable storage expansion will prefer the Color 6.