PhoneLifespan

15 vs Redmi Turbo 4

vs

Winner

Xiaomi 15

Lifespan decides this one: the 15 is supported until Mar 2030 at $16.87 per month of safe use, while the Redmi Turbo 4 runs out in Jan 2029 ($7.04/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 15 67 · Redmi Turbo 4 76 — methodology

The lifespan decider

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

Xiaomi 15 $750
Safe to buy$16.87/mo
2025◆ Buy-by Mar 20282030
Xiaomi Redmi Turbo 4 $215
Buy with care$7.04/mo
2025◆ Buy-by Jan 20272029

Category by category

Display
15 90Redmi Turbo 4 80

The 15's screen is the better one — 6.36-inch crystalres amoled, 2670×1200 (460 ppi), 1–120hz ltpo, up to 3200 nits peak, dolby vision/hdr10+.

Performance
15 98Redmi Turbo 4 78

The 15's Snapdragon 8 Elite is simply the faster chip.

Camera
15 79Redmi Turbo 4 67

The 15 has the stronger camera system (3 real rear lenses vs 2).

Battery
15 85Redmi Turbo 4 100

6,550mAh vs 5,240mAh — the Redmi Turbo 4 lasts longer between charges.

Software longevity
15 53Redmi Turbo 4 36

The 15 is supported until Mar 2030 — 14 months longer than the Redmi Turbo 4.

Value
15 67Redmi Turbo 4 76

Overall value goes to the Redmi Turbo 4 at $7.04 per month of safe use.

Full spec table
Spec15Redmi Turbo 4
Price (street)$750$215
Display6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+6.67-inch LTPS OLED, 1.5K, 120Hz, 3200 nits peak
ChipsetSnapdragon 8 EliteMediaTek Dimensity 8400-Ultra (4nm)
RAM12GB12GB/16GB
Storage256GB/512GB256GB/512GB
Battery5,240 mAh6,550 mAh
Charging90W wired, 50W wireless90W wired
Rear cameras50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)50MP main, 8MP ultra-wide
Dimensions152.3 × 71.2 × 8.08 mm161 × 75.2 × 8.1 mm
Weight191 g204 g
Water resistanceIP68IP68
Supported untilMar 2030Jan 2029
15 full verdict →Redmi Turbo 4 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.