PhoneLifespan

Phone (3a) vs 15T

vs

Winner

Nothing Phone (3a)

The Phone (3a) wins this one, taking display and software longevity decisively. Against the 15T it's also the sounder buy at $6.16 per month of safe use.

Value Score: Phone (3a) 75 · 15T 70 — methodology

The lifespan decider

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

Nothing Phone (3a) $349
Safe to buy$6.16/mo
2025◆ Buy-by Mar 20292031
Xiaomi 15T $500
Safe to buy$9.73/mo
2025◆ Buy-by Sep 20282030

Category by category

Display
Phone (3a) 8015T 70

The Phone (3a)'s screen is the better one — 6.77-inch amoled, 1080×2392 (fhd+), up to 120hz, 3000 nits peak.

Performance
Phone (3a) 6415T 78

The 15T's MediaTek Dimensity 8400-Ultra is simply the faster chip.

Camera
Phone (3a) 7915T 79

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

Battery
Phone (3a) 8015T 90

5,500mAh vs 5,000mAh — the 15T lasts longer between charges.

Software longevity
Phone (3a) 6715T 61

The Phone (3a) is supported until Mar 2031 — 5 months longer than the 15T.

Value
Phone (3a) 7515T 70

Overall value goes to the Phone (3a) at $6.16 per month of safe use.

Full spec table
SpecPhone (3a)15T
Price (street)$349$500
Display6.77-inch AMOLED, 1080×2392 (FHD+), up to 120Hz, 3000 nits peak6.83-inch AMOLED, 2772x1280, 144Hz
ChipsetSnapdragon 7s Gen 3MediaTek Dimensity 8400-Ultra
RAM8GB/12GB12GB
Storage128GB/256GB256GB/512GB
Battery5,000 mAh5,500 mAh
Charging50W wired, no wireless67W wired
Rear cameras50MP main, 50MP telephoto 2x, 8MP ultra-wide50MP main, 50MP telephoto 2x, 12MP ultra-wide
Dimensions163.52 × 77.50 × 8.35 mm163.2 × 78.0 × 7.5 mm
Weight201 g194 g
Water resistanceIP64IP68
Supported untilMar 2031Sep 2030
Phone (3a) full verdict →15T 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.