Does Royal Mail work on iPhone Duo?
Not yet. Royal Mail's current version (18.5.3, 1 October 2026) came out before Apple's iPhone Duo tools, so on the inner screen it opens in an iPhone-size window with black bars. It works, just not full screen.
- On iPhone Duo
- Not yet
- Developer
- Royal Mail Group Ltd
- Category
- Lifestyle
- Current version
- 18.5.3 · 1 October 2026
- App Store rating
- 4.6 out of 5 (413,878 ratings)
- Last checked
How we know
Its current version is older than Apple's iPhone Duo tools (5 October 2026): on the inner screen it opens in an iPhone-size window with black bars. See it on the App Store
History on iPhone Duo
- · Not yet (version 18.5.3)
Other Lifestyle apps on iPhone Duo
-
TinderTinder LLC · LifestyleUpdated, unconfirmedUpdated 27 October 2026 -
郵便局公式アプリJapan Post Co., Ltd. · LifestyleNot yetLast update 14 September 2026 -
タイミーTimee, inc. · LifestyleUpdated, unconfirmedUpdated 26 October 2026 -
ahamo（アハモ）株式会社NTTドコモ · LifestyleNot yetLast update 30 September 2026 -
CHARGESPOT チャージスポット スマホ充電レンタルINFORICH ASIA HONG KONG LIMITED · LifestyleUpdated, unconfirmedUpdated 20 October 2026 -
majica～電子マネー公式アプリ～PAN PACIFIC INTERNATIONAL HOLDINGS CORPORATION · LifestyleNot yetLast update 20 July 2026 -
Auday航江 郭 · LifestyleAdaptedRelease notes, version 1.0.7 -
TRUSTDOCK（トラストドック）株式会社TRUSTDOCK · LifestyleUpdated, unconfirmedUpdated 28 October 2026
All apps on iPhone Duo in Japan →
Got an iPhone Duo? How does Royal Mail look on the inner screen?
No owner report yet for version 18.5.3.
Still looking for the iPhone Duo itself? Restocks sell out within minutes: get an alert the moment one lands near you.
Good to know
Does Royal Mail work on iPhone Duo?
Not yet. Royal Mail's current version (18.5.3, 1 October 2026) came out before Apple's iPhone Duo tools, so on the inner screen it opens in an iPhone-size window with black bars. It works, just not full screen.
Why do some apps have black bars on iPhone Duo?
Because they were built before Apple's iPhone Duo tools. On the inner screen, an app built for an older iOS opens in an iPhone-size window on a black background; one built for iOS 27.0 uses more of it but leaves some space blank; only apps built with the iOS 27.1 SDK, which developers have had since 5 October 2026, use the whole display.
When will Royal Mail be adapted to iPhone Duo?
Only Royal Mail Group Ltd knows. We check Royal Mail on the App Store again within about 1 h: this page changes as soon as a new version says it supports iPhone Duo.
Do apps that aren't adapted still work on iPhone Duo?
Yes. Every iPhone app runs on iPhone Duo: one that isn't adapted just doesn't fill the inner screen until its developer updates it.
How we measure
Sources: Apple's list of apps adapted to iPhone Duo (22 October 2026) and each app's App Store record (version, release date, release notes, description). Apple doesn't say which tools an app was built with, so an app stays “Updated, unconfirmed” until its developer says more.