iPhone 18 vs. Galaxy S27: What's Confirmed, What's Rumored, and What Nobody Actually Knows Yet

Before We Start: Read This First

Neither the iPhone 18 nor the Galaxy S27 has been announced as of mid-2025. Apple is currently selling the iPhone 16 series; the iPhone 17 is expected in September 2025. Samsung is currently selling the Galaxy S25 series; the S26 is expected in early 2026. Everything in this article about these future devices is therefore pre-announcement intelligence — drawn from supply chain leaks, analyst reports, patent filings, and historical release patterns.

Three labels are used strictly throughout, with no exceptions:

• [CONFIRMED] — Officially stated by Apple or Samsung, or an established, documented fact
• [RUMORED] — Reported by credible sources but not officially verified
• [UNKNOWN] — No reliable data currently exists; no guess will be offered

Why Compare Them at All?

Because both phones are already shaping purchasing decisions. Consumers are holding off upgrades. Carriers are building promotions around projected specs. The comparison is happening whether or not the phones exist yet — so it deserves to be done honestly.

Quick-Reference Table

| Feature | iPhone 18 | Galaxy S27 | |---|---|---| | Release window | [RUMORED]: Fall 2026 | [RUMORED]: Early 2027 | | Chipset | [RUMORED]: Apple A20, TSMC 2nm | [RUMORED]: Snapdragon 8 Elite Gen 2 and/or next Exynos | | Display type | [RUMORED]: OLED, ProMotion | [RUMORED]: Dynamic AMOLED 2X | | Display size | [UNKNOWN] | [UNKNOWN] | | Under-display Face ID | [RUMORED] | [UNKNOWN] | | Under-display camera | [UNKNOWN] | [RUMORED] | | Design overhaul | [RUMORED]: Cleaner front, possible pill/bar elimination | [UNKNOWN] | | USB-C | [CONFIRMED]: Established since iPhone 15 | [CONFIRMED]: Established standard | | Satellite connectivity | [CONFIRMED]: In current lineup | [CONFIRMED]: In current lineup | | Foldable variant | [UNKNOWN] | [RUMORED]: S27 Fold expected | | AI features | [RUMORED]: Expanded Apple Intelligence | [RUMORED]: Next-gen Galaxy AI | | Starting price | [UNKNOWN] | [UNKNOWN] | | Official announcement | Not yet made | Not yet made |

Release Date

iPhone 18 [RUMORED] Apple has launched mainline iPhones at September events consistently since 2012, with only minor deviations. Projecting that pattern forward, the iPhone 18 would arrive in September 2026. This is a pattern projection, not a scheduled announcement.

Galaxy S27 [RUMORED] Samsung launches its Galaxy S flagship series at Unpacked events in January or February. The S25 launched in January 2025. Following the expected S26 in early 2026, the S27 would logically arrive in early 2027.

Important timing note: These two phones could be separated by roughly six months in availability. They are not strict simultaneous competitors. Any "head-to-head at launch" framing is already a conceptual compromise. Keep that in mind throughout.

Processor and Chip Performance

iPhone 18 — Apple A20 [RUMORED]

Multiple supply chain analysts — including Ming-Chi Kuo and sources tracked by Bloomberg and MacRumors — expect Apple to use a chip provisionally called the A20, manufactured on TSMC's 2nm-class process node. Apple used TSMC's 3nm process for the A17 Pro (iPhone 15 Pro) and A18/A18 Pro (iPhone 16 series). The move toward 2nm aligns with TSMC's publicly stated production roadmap for 2025–2026.

Expected practical benefits: improved Neural Engine throughput for on-device AI, better power efficiency, and continued single-core performance leadership.

[UNKNOWN]: Specific