PhoneLifespan

P3 Ultra 5G vs 15T

vs

Winner

Xiaomi 15T

Lifespan decides this one: the 15T is supported until Sep 2030 at $9.76 per month of safe use, while the P3 Ultra 5G runs out in Mar 2029 ($9.49/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: P3 Ultra 5G 74 · 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.

Realme P3 Ultra 5G $315
Buy with care$9.49/mo
2025◆ Buy-by Mar 20272029
Xiaomi 15T $500
Safe to buy$9.76/mo
2025◆ Buy-by Sep 20282030

Category by category

Display
P3 Ultra 5G 7015T 70

Both displays are effectively the same class.

Performance
P3 Ultra 5G 7415T 78

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

Camera
P3 Ultra 5G 6715T 79

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

Battery
P3 Ultra 5G 10015T 90

6,000mAh vs 5,500mAh — the P3 Ultra 5G lasts longer between charges.

Software longevity
P3 Ultra 5G 4015T 61

The 15T is supported until Sep 2030 — 18 months longer than the P3 Ultra 5G.

Value
P3 Ultra 5G 7415T 70

Overall value goes to the P3 Ultra 5G at $9.49 per month of safe use.

Full spec table
SpecP3 Ultra 5G15T
Price (street)$315$500
Display6.83-inch AMOLED, 1.5K, 120Hz, up to 1500 nits peak, Gorilla Glass 7i6.83-inch AMOLED, 2772x1280, 144Hz
ChipsetMediaTek Dimensity 8350 Ultra (4nm)MediaTek Dimensity 8400-Ultra
RAM8GB/12GB12GB
Storage128GB/256GB/512GB256GB/512GB
Battery6,000 mAh5,500 mAh
Charging80W wired (100% in 47 min), 5W reverse67W wired
Rear cameras50MP main, 8MP ultra-wide50MP main, 50MP telephoto 2x, 12MP ultra-wide
Dimensions163.1 × 76.9 × 7.4 mm163.2 × 78.0 × 7.5 mm
Weight183 g194 g
Water resistanceIP68/IP69IP68
Supported untilMar 2029Sep 2030
P3 Ultra 5G 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.