PhoneLifespan

Galaxy M55 5G vs Redmi Note 15 Pro 5G

vs

Winner

Xiaomi Redmi Note 15 Pro 5G

Lifespan decides this one: the Redmi Note 15 Pro 5G is supported until Jan 2030 at $7.45 per month of safe use, while the Galaxy M55 5G runs out in Mar 2029 ($8.10/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: Galaxy M55 5G 72 · Redmi Note 15 Pro 5G 73 — methodology

The lifespan decider

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

Samsung Galaxy M55 5G $270
Buy with care$8.10/mo
2024◆ Buy-by Mar 20272029
Xiaomi Redmi Note 15 Pro 5G $320
Safe to buy$7.45/mo
2026◆ Buy-by Jan 20282030

Category by category

Display
Galaxy M55 5G 70Redmi Note 15 Pro 5G 70

Both displays are effectively the same class.

Performance
Galaxy M55 5G 70Redmi Note 15 Pro 5G 62

The Galaxy M55 5G's Qualcomm Snapdragon 7 Gen 1 is simply the faster chip.

Camera
Galaxy M55 5G 67Redmi Note 15 Pro 5G 72

The Redmi Note 15 Pro 5G has the stronger camera system — same lens count, higher-grade sensors.

Battery
Galaxy M55 5G 80Redmi Note 15 Pro 5G 100

6,580mAh vs 5,000mAh — the Redmi Note 15 Pro 5G lasts longer between charges.

Software longevity
Galaxy M55 5G 40Redmi Note 15 Pro 5G 51

The Redmi Note 15 Pro 5G is supported until Jan 2030 — 10 months longer than the Galaxy M55 5G.

Value
Galaxy M55 5G 72Redmi Note 15 Pro 5G 73

Pound for pound, these two are equally good deals.

Full spec table
SpecGalaxy M55 5GRedmi Note 15 Pro 5G
Price (street)$270$320
Display6.7-inch Super AMOLED Plus, 1080x2400 (FHD+), 120Hz6.83-inch AMOLED, 1.5K, 120Hz, 12-bit, Dolby Vision/HDR10+
ChipsetQualcomm Snapdragon 7 Gen 1MediaTek Dimensity 7400-Ultra (4nm)
RAM8GB/12GB8GB/12GB
Storage128GB/256GB256GB/512GB
Battery5,000 mAh6,580 mAh
Charging45W wired45W wired, 22.5W reverse wired
Rear cameras50MP main, 8MP ultra-wide, 2MP macro200MP main, 8MP ultra-wide
Dimensions163.9 × 76.5 × 7.8 mm163.6 × 78.1 × 8.0 mm
Weight180 g210 g
Water resistanceNoneIP68/IP69
Supported untilMar 2029Jan 2030
Galaxy M55 5G full verdict →Redmi Note 15 Pro 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.