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iPhone Duo goes on sale Oct 23, 2026. Developers are likely to update their apps then, so statuses are for reference until launch.

Release day, your time1 day 03:27:06

All apps

USPS Mobile®

United States Postal ServiceBusiness

View in the App Store
On iPhone Duo

Letterboxed

USPS Mobile® runs in an iPhone-sized window with black bars.

Its latest version is built with the iOS 18.2 SDK,[1] which Apple shows letterboxed on the inner display.[2]

How we know
From the app’s build
Checked on
Version 5.36.42
Build
iOS 18.2 SDK
Latest version
5.36.42
Status updated

What owners report

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Sources

  1. App Store build, version 5.36.42

    Built with the iOS 18.2 SDK. Uses none of Apple’s iPhone Duo APIs.

  2. Apple Developer: Prepare your app for iPhone Duo
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