iPhone evolution:
every model, 2007 to 2026

The table groups every main generation by design era. Screen sizes are the largest model of each year.

Table: Every main iPhone generation and its defining design change (Apple Newsroom and launch coverage)

Largest iPhone screen, 2007 → 2024

3.5 → 6.9 in

iPhone Air, the thinnest iPhone (2025)

5.6 mm

App downloads in the App Store's first weekend (2008)

10 million

Starting price of the foldable iPhone Duo (2026)

$1,999

The first iPhone's design decision was subtraction: no keyboard, no stylus, one physical button below the screen. Apple's announcement called it "a revolutionary mobile phone" whose multi-touch interface let fingers do what the keyboards of BlackBerry and Nokia phones did with keys¹. The screen was 3.5 inches and 320 × 480 pixels, and the phone cost $499 or $599 with a two-year contract.

iPhone 3G (2008) added 3G networking and, more importantly, shipped alongside the App Store, which opened on 10 July 2008. Apple reported 10 million app downloads in the first weekend². The aluminium back became plastic because metal blocked the new radios, the first of many times a component dictated the design.

iPhone 4 (2010) is often called the most beautiful iPhone. It sandwiched glass front and back around a stainless-steel band that was also the antenna, and its 326 pixels-per-inch "Retina" display was sharp enough that, Apple said, the eye could not see individual pixels at normal viewing distance³. The band produced the "antennagate" controversy when a hand bridged the gap between antenna sections.

iPhone 5 (2012) stretched the screen to 4 inches without making it wider, so the phone still fit a hand, and replaced the 30-pin dock connector with the reversible Lightning port. iPhone 5s (2013) hid a fingerprint sensor, Touch ID, in the home button.

iPhone 6 and 6 Plus (2014) were the big break. Apple had resisted large screens while Android phones grew; now it shipped 4.7 and 5.5 inches, with rounded edges that made the larger slab easier to hold. iPhone 7 (2016) removed the 3.5 mm headphone jack and replaced the mechanical home button with a solid-state one that clicked using haptic feedback.

Screens grew because people used phones for video, maps and reading more than for calls, and because shrinking bezels let Apple add screen without adding as much body. The trade-off was reach. In 2013 the mobile UX researcher Steven Hoober observed 1,333 people using phones in public and found 49% held them in one hand, operating them with a thumb¹³. On a large screen, the top-left corner is out of comfortable thumb reach for a right-handed user.

Apple's answers were software: Reachability (2014) slides the top of the screen down, and later iOS versions moved search fields and tab bars to the bottom. This is Fitts's law at work: the time to hit a target depends on its distance and size, and on a phone distance is measured from the thumb.

iPhone X, announced in September 2017, was Apple's ten-year redesign. It ran the OLED screen nearly edge to edge, replaced the home button with a swipe up from the bottom, and replaced Touch ID with Face ID, which projects more than 30,000 invisible dots to map a face⁴. The sensors had to go somewhere, so the screen wrapped around a black cut-out at the top: the notch. Critics hated it; within two years most Android flagships had copied it.

iPhone 11 (2019) introduced the square camera bump with an ultra-wide lens. iPhone 12 (2020) brought back the flat sides of iPhone 4 and 5, added 5G and introduced MagSafe, a ring of magnets on the back for chargers and accessories⁵.

In September 2022 the iPhone 14 Pro shrank the notch into a floating pill and made software animate around it. Apple named it the Dynamic Island: timers, calls, music and maps expand out of the black shape and shrink back into it⁶. It is a strong example of design turning a hardware constraint into a feature people use.

iPhone 15 (2023) made two changes forced from outside and one by choice. The EU's common charger directive required USB-C on phones sold in the EU from the end of 2024⁸, so the whole range moved to USB-C after 11 years of Lightning. The Pro models switched from stainless steel to titanium, cutting weight, and replaced the mute switch with a programmable Action button⁷. iPhone 16 (2024) added Camera Control, a pressure-sensitive button for the camera, and the Pro Max reached 6.9 inches.

In September 2025 Apple launched the iPhone Air, 5.6 mm thick, with a titanium frame and a single rear camera housed in a plateau across the top of the back⁹. The iPhone 17 Pro moved the other way on material: an aluminium unibody chosen for heat dissipation and battery space. Apple's affordable model, the iPhone 17e, followed on 2 March 2026 at $599¹⁰.

On 9 September 2026 Apple announced the iPhone 18 Pro, starting at $1,199, and its first foldable, the iPhone Duo: a book-style phone with a 5.4-inch outer screen and a 7.6-inch inner screen, starting at $1,999¹¹¹². The Duo went on sale on 23 October 2026. The base iPhone 18 was held back to spring 2027, splitting Apple's launch calendar for the first time.

Each hardware era changed where people's thumbs could reach and what the top of the screen was for, and apps that ignored it felt dated within a year.

• Primary actions at the bottom — since the 6 Plus, the bottom third of the screen is where thumbs rest; tab bars and main buttons belong there.
• Respect the safe areas — the notch, the Dynamic Island and the home indicator all reserve space; content under them gets clipped or blocked.
• Design for a range, not a size — apps run on 4.7-inch SEs and 7.6-inch foldables at the same time.
• Use system gestures, don't fight them — swipe-up-to-go-home (2017) means bottom-edge swipes inside apps conflict with the system.
• Treat live status as a surface — Live Activities in the Dynamic Island are where delivery, ride and score updates now live.

If your app was designed for one phone and now feels awkward on others, a mobile app UX audit checks reach, safe areas and gesture conflicts on real devices.

Launch dates, sizes and features come from Apple's own Newsroom announcements for each generation, the EU directive text for USB-C, and launch coverage from MacRumors and CNBC for the September 2026 event, whose press releases were checked in October 2026. Thumb-reach findings come from Steven Hoober's published observational study. Photos are from Wikimedia Commons, credited under each image. Last reviewed October 2026.