PhoneLifespan

C71 vs Redmi 15 5G

vs

Winner

Xiaomi Redmi 15 5G

Lifespan decides this one: the Redmi 15 5G is supported until Aug 2029 at $4.80 per month of safe use, while the C71 runs out in Jun 2028 ($6.38/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: C71 71 · Redmi 15 5G 75 — methodology

The lifespan decider

When specs are close, support length decides it — this is what each phone costs per month of safe use.

Realme C71 $150
Buy with care$6.38/mo
2025◆ Buy-by Jun 20262028
Xiaomi Redmi 15 5G $180
Safe to buy$4.80/mo
2025◆ Buy-by Aug 20272029

Category by category

Display
C71 70Redmi 15 5G 70

Both displays are effectively the same class.

Performance
C71 55Redmi 15 5G 46

The C71's Unisoc T7250 (12nm) is simply the faster chip.

Camera
C71 55Redmi 15 5G 55

Camera systems are comparable on paper — pick by sample photos.

Battery
C71 100Redmi 15 5G 100

Battery capacities are close enough not to decide this.

Software longevity
C71 28Redmi 15 5G 45

The Redmi 15 5G is supported until Aug 2029 — 14 months longer than the C71.

Value
C71 71Redmi 15 5G 75

Overall value goes to the Redmi 15 5G at $4.80 per month of safe use.

Full spec table
SpecC71Redmi 15 5G
Price (street)$150$180
Display6.67-inch IPS LCD, HD+, 120Hz, 725 nits6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak
ChipsetUnisoc T7250 (12nm)Qualcomm Snapdragon 6s Gen 3
RAM4GB/6GB/8GB4GB/6GB/8GB
Storage64GB/128GB/256GB128GB/256GB
Battery6,300 mAh7,000 mAh
Charging45W wired (50% in 36 min), 6W reverse wired33W wired, 18W reverse wired
Rear cameras50MP main50MP main, 2MP depth
Dimensions165.8 × 75.9 × 7.8 mm169.5 × 80.5 × 8.4 mm
Weight196 g217 g
Water resistanceSplash/dust resistant, MIL-STD-810H, 1.5m drop resistanceIP64
Supported untilJun 2028Aug 2029
C71 full verdict →Redmi 15 5G full verdict →Longevity master board →

Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.