PhoneLifespan

iPhone 15 vs Redmi K70 Ultra

vs

Winner

Apple iPhone 15

Lifespan decides this one: the iPhone 15 is supported until Sep 2030 at $8.40 per month of safe use, while the Redmi K70 Ultra runs out in Jul 2028 ($15.17/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: iPhone 15 62 · Redmi K70 Ultra 73 — methodology

The lifespan decider

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

Apple iPhone 15 $430
Safe to buy$8.40/mo
2023◆ Buy-by Sep 20282030
Xiaomi Redmi K70 Ultra $380
Buy with care$15.17/mo
2024◆ Buy-by Jul 20262028

Category by category

Display
iPhone 15 50Redmi K70 Ultra 80

The Redmi K70 Ultra's screen is the better one — 6.67-inch amoled, 1.5k, 144hz, 4000 nits peak, dolby vision.

Performance
iPhone 15 80Redmi K70 Ultra 95

The Redmi K70 Ultra's MediaTek Dimensity 9300+ (4nm) is simply the faster chip.

Camera
iPhone 15 62Redmi K70 Ultra 67

The Redmi K70 Ultra has the stronger camera system — same lens count, higher-grade sensors.

Battery
iPhone 15 47Redmi K70 Ultra 90

5,500mAh vs 3,349mAh — the Redmi K70 Ultra lasts longer between charges.

Software longevity
iPhone 15 61Redmi K70 Ultra 30

The iPhone 15 is supported until Sep 2030 — 26 months longer than the Redmi K70 Ultra.

Value
iPhone 15 62Redmi K70 Ultra 73

Overall value goes to the Redmi K70 Ultra at $15.17 per month of safe use.

Full spec table
SpeciPhone 15Redmi K70 Ultra
Price (street)$430$380
Display6.1-inch Super Retina XDR OLED, 60Hz, Dynamic Island, up to 2000 nits peak6.67-inch AMOLED, 1.5K, 144Hz, 4000 nits peak, Dolby Vision
ChipsetApple A16 BionicMediaTek Dimensity 9300+ (4nm)
RAM6GB12GB/16GB/24GB
Storage128GB/256GB/512GB256GB/512GB/1TB
Battery3,349 mAh5,500 mAh
ChargingWired ~50% in 30 min with 20W+; MagSafe 15W wireless120W wired
Rear cameras48MP main, 12MP ultra-wide50MP main, 8MP ultra-wide, 2MP macro
Dimensions147.6 × 71.6 × 7.80 mm160.4 × 75.1 × 8.4 mm
Weight171 g211 g
Water resistanceIP68IP68
Supported untilSep 2030Jul 2028
iPhone 15 full verdict →Redmi K70 Ultra 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.