Lifestyle v3.5.9
Does 交管12123 work on iPhone Duo?
It works, but with black bars. 交管12123 3.5.9 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
At a glance
- Inner display (7.6″)
- Black bars
- Outer display (5.4″)
- Works normally
- Built with
- iOS 26.2 SDK
- Version 3.5.9, read Oct 24, 2026
- iPad version
- No
- Phone-only layout today
- Latest version
- v3.5.9
- Oct 19, 2026
- Duo in release notes
- Not yet
About 交管12123
交管12123 is made by 公安部交通管理科学研究所 and first came out on the App Store in January 2016. It's only on the China App Store, where it has 3,077,189 ratings. Version 3.5.9 came out on Oct 19, 2026 and needs iOS 15.0 or later. It's free to download.
From its App Store listing:
“交管12123”是公安部官方互联网交通安全综合服务管理平台（*.122.gov.cn，以下简称互联网平台）的唯一手机客户端应用软件，由公安部交通管理科学研究所负责研发并提供技术支持。本软件服务对象为全国机动车车主、驾驶人等广大用户。 本软件具备以下功能： 1、用户注册。 2、绑定本人机动车和驾驶证。 3、电子监控设备记录的违法行为处理。 4、机动车驾驶人考试预约。 5、新车预选机动车号牌。 6、补换领机动车行驶证、机动车号牌、机动车驾驶证，补领机动车安全技术检验合格标志。 7、机动车驾驶证延期换证、延期审验、延期提交身体条件证明。 8、机动车、驾驶证相关信息查询及告知提示。 9、交通管理相关业务办理地点导航。 ＊温馨提示：目前各地互联网平台尚在推广应用过程中，用户只能使用其牌证所在地、违法发生地互联网平台启用的相应功能。对于尚未启用的功能，用户暂时无法使用，敬请耐心等待。
On the inner display
Apps built with older SDKs are placed in a phone-sized safe area on a black background. Everything works; you just don't get the bigger screen.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including 交管12123. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 3.5.9 is built with the iOS 26.2 SDK
Apple runs apps built with the iOS 26 SDK or earlier in a phone-sized window on the inner display.
- : Not confirmed yet → Black bars — built with the iOS 26.2 SDK
Latest release notes
Version 3.5.9 · Oct 19, 2026
1、解决已知问题。
Questions
Does 交管12123 work on iPhone Duo?
It works, but with black bars. 交管12123 3.5.9 is built with the iOS 26.2 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does 交管12123 work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use 交管12123 in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.
Why does 交管12123 have black bars on iPhone Duo?
Apps built with the iOS 26 SDK or earlier run in a phone-sized window on the inner display, and iOS 27 builds can still leave some space empty. The bars disappear once the developer rebuilds the app with the iOS 27.1 SDK — you only need to update the app.
When will 交管12123 fill iPhone Duo's inner display?
When its developer releases an update built with the iOS 27.1 SDK or later. We read the SDK of every new version of 交管12123 within about a day of its release and update this page.
What can I do about the black bars until then?
Use 交管12123 on the outer display, where it works like on any iPhone, or put it in Split View next to another app on the inner display so less of the screen goes unused.