PhoneLifespan

P3x 5G 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 P3x 5G runs out in Feb 2029 ($4.64/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: P3x 5G 73 · 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 P3x 5G $150
Buy with care$4.64/mo
2025◆ Buy-by Feb 20272029
Xiaomi Redmi 15 5G $180
Safe to buy$4.80/mo
2025◆ Buy-by Aug 20272029

Category by category

Display
P3x 5G 70Redmi 15 5G 70

Both displays are effectively the same class.

Performance
P3x 5G 55Redmi 15 5G 46

The P3x 5G's MediaTek Dimensity 6400 (6nm) is simply the faster chip.

Camera
P3x 5G 55Redmi 15 5G 55

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

Battery
P3x 5G 100Redmi 15 5G 100

Battery capacities are close enough not to decide this.

Software longevity
P3x 5G 38Redmi 15 5G 45

The Redmi 15 5G is supported until Aug 2029 — 5 months longer than the P3x 5G.

Value
P3x 5G 73Redmi 15 5G 75

Pound for pound, these two are equally good deals.

Full spec table
SpecP3x 5GRedmi 15 5G
Price (street)$150$180
Display6.72-inch IPS LCD, FHD+, 120Hz6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak
ChipsetMediaTek Dimensity 6400 (6nm)Qualcomm Snapdragon 6s Gen 3
RAM6GB/8GB4GB/6GB/8GB
Storage128GB128GB/256GB
Battery6,000 mAh7,000 mAh
Charging45W wired SuperVOOC33W wired, 18W reverse wired
Rear cameras50MP main, 2MP depth50MP main, 2MP depth
Dimensions165.7 × 76.2 × 7.99 mm169.5 × 80.5 × 8.4 mm
Weight197 g217 g
Water resistanceIP68/IP69IP64
Supported untilFeb 2029Aug 2029
P3x 5G 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.