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Caller ID

Apero Technologies GroupBusiness

View in the App Store
On iPhone Duo

Letterboxed

Caller ID runs in an iPhone-sized window with black bars.

Want Caller ID to fill the inner display? Be the first to ask.

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 1.3.6
Build
iOS 18.2 SDK
Latest version
1.3.6, Oct 8, 2025
Status updated

What owners report

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Version history

  1. Version 1.3.6Letterboxed

    iOS 18.2 SDK

    Checked Oct 30, 2026

Sources

  1. App Store build, version 1.3.6

    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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