[Bug]: PhonePermissionStrategy.checkServiceStatus calls completionHandler twice, causing crashes

[ryanaidilp]

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• I have searched the existing issues.
• I have carefully read the documentation and verified I have added the required platform specific configuration.

Please select affected platform(s)

• Android
• iOS
• Windows

Steps to reproduce

1. Call Permission.phone.serviceStatus (or anything that triggers checkServiceStatus for the phone permission) on a device/simulator where [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"tel://"]] returns NO (e.g. iPad, or a device without telephony capability).
2. In PhonePermissionStrategy.m, the if (![app canOpenURL:telURL]) branch calls completionHandler(ServiceStatusNotApplicable) but does not return, so execution falls through and calls completionHandler(...) a second time with the enabled/disabled status.
3. The Flutter method channel result callback backing completionHandler is only expected to be invoked once; the second invocation raises an exception/crash.

We noticed this because checkServiceStatus/PhonePermissionStrategy shows up as one of the top crashes in our production consumer app in Firebase Crashlytics, affecting users on devices where canOpenURL: returns NO for tel://.

Expected results

completionHandler should be invoked exactly once per call to checkServiceStatus.

Actual results

completionHandler is invoked twice when the device cannot open tel:// URLs, which can crash the app.

Code sample

Code sample

// permission_handler_apple/ios/permission_handler_apple/Sources/permission_handler_apple/strategies/PhonePermissionStrategy.m

- (void)checkServiceStatus:(PermissionGroup)permission completionHandler:(ServiceStatusHandler)completionHandler {
  UIApplication *app = [UIApplication sharedApplication];
  NSURL *telURL = [NSURL URLWithString:@"tel://"];
  if (![app canOpenURL:telURL]) {
      completionHandler(ServiceStatusNotApplicable);
      // missing `return;` here — falls through and calls completionHandler again below
  }
  completionHandler([self canDevicePlaceAPhoneCall] ? ServiceStatusEnabled : ServiceStatusDisabled);
}

Screenshots or video

Screenshots or video demonstration

Crashlytics shows this as a top crash in our production app; no visual repro available since it's a native-side double-callback crash.

Version

9.6.1 (permission_handler_apple)

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.47.4, on macOS 26.6.2 25G83 darwin-arm64, locale en-ID) [2.1s]
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[✓] Android toolchain - develop for Android devices (Android SDK version 36.0.0) [1,082ms]
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