iOS 27.3 Is Coming: Reachability for iPhone Duo, the New Health App, Duo-Style StandBy and More

Quick summary: Apple has been testing iOS 27.3 since November 3, and MacRumors calls it “the biggest update to iOS 27 since it launched in September.” In a post today, 9to5Mac says it’s coming next month, and Apple says the redesigned Health app will roll out as a free update later this year. If you own an iPhone Duo, there’s a lot in here for you. Here’s what’s in the beta so far.

Key takeaways

• iPhone Duo gets Reachability (swipe from the side) and a tweaked front-screen keyboard.
• StandBy from iPhone Duo comes to every iPhone that runs iOS 27.
• Siri AI can do more inside Apple’s apps, like unsubscribing you from mailing lists in Mail.
• The redesigned Health app returns with new Insights and Longevity tabs and a Health Age score.
• Safari gets vertical tabs and an adaptive dark mode for sites that don’t have one.
• It’s still a beta, so features can change before release.

For iPhone Duo owners

Reachability, sideways. On regular iPhones, Reachability pulls the screen down. On iPhone Duo, MacRumors says you swipe left from the left edge or right from the right edge of the outer display to bring content closer to your thumb. You turn it on in Settings > Accessibility > Touch. One MacRumors commenter wished it also worked top to bottom, and I get it, but for a wide screen this makes sense.

A new front keyboard. On the Duo’s front display, the emoji and number keys swap places, and so do the microphone and return keys. MacRumors says keys are slightly taller and thinner, the space bar is wider, and the letters are a bit smaller and less bold.

StandBy for every iPhone

The StandBy upgrades that debuted on iPhone Duo are coming to every iPhone that can run iOS 27, per MacRumors: updated Analog and Digital Clock faces with more color and complication options, an updated Photos face, new Calendar and Weather faces, and the ability to make multiple versions of each face and swipe between them. One MacRumors commenter testing it said regular iPhones still need to be landscape and charging for StandBy, so you’ll still want a charger or stand nearby. If you have a Duo, here’s my StandBy on iPhone Duo how-to.

Siri AI does more in Apple’s apps

Apple is adding new Siri AI actions across Calendar, Files, Journal, Mail, Maps, Messages, Music, Notes, Photos, Preview, Reminders, Safari, Shortcuts and Weather. MacRumors’ examples:

• Mail: unsubscribe from mailing lists and undo recently sent messages
• Safari: clear browsing history, manage tabs and windows, save to Reading List, close duplicate tabs
• Files: organize content and delete files you haven’t opened in a while
• Weather: add locations and control weather notifications

MacRumors says you can ask Siri what it can do in each app to see the new actions. Apple is also opening Siri AI to any developer through App Intents, and adding Traditional Chinese, Vietnamese, Turkish and Norwegian.

The new Health app

Apple’s own announcement says the redesigned Health app is built with Apple Intelligence at its core:

• Insights tab: summaries of heart, sleep, readiness, fitness, vitals and cycle tracking, plus a For You section with recommendations.
• Longevity tab: tracks heart health, sleep, mental wellbeing, movement, metabolic health, hearing and nutrition over time, with Health Age, which compares your Apple Watch data (VO2 max, resting heart rate, sleep, heart rate variability) to your actual age. You can add lab results like A1c and LDL cholesterol.
• At-home movement tests: Using your iPhone camera and Apple Watch, you can measure flexibility, strength, balance and VO2 max. Apple says it runs entirely on device and no video is recorded, stored or shared.

Fine print from Apple: it needs an Apple Intelligence-enabled iPhone or iPad, Health Age requires Apple Watch, and the VO2 max test needs Apple Watch, AirPods Pro 3 or a third-party heart rate sensor.

Everything else worth knowing

• Siri Recap and Live Rewind for Apple Watch Series 12 and Ultra 4 (watchOS 27.3 plus iOS 27.3). 9to5Mac says recaps live in a new Recaps tab in the Siri app for seven days unless you save them.
• Safari: Vertical Tabs and Adaptive Dark Mode for sites without a dark design, plus a Use Global Privacy Control option.
• Control Center: the VPN toggle now lets you switch between VPNs.
• Apple Music: Selfie Sing, which records video of you singing karaoke.
• Apple Fitness+: a new Gym Strength workout plan.

My take

Reachability alone makes this a must-install for iPhone Duo owners. That outer screen is wide, and reaching the far corner one-handed is a real thing. I’d wait for the public release rather than jumping on the beta with your daily phone, though. And since StandBy needs your iPhone charging, a MagSafe battery like the Anker 10000mAh MagSafe Portable Charger lets you use it away from the wall.

Sources

• MacRumors: Everything New in the iOS 27.3 Beta (Nov 3, 2026, updated)
• 9to5Mac: iOS 27.3 adds three new features I’ve used almost every day (Nov 13, 2026)
• 9to5Mac: Everything new in iOS 27.3 beta 1 so far (Nov 3, 2026)
• Apple Newsroom: Redesigned Health app expands language support (Nov 3, 2026)