# Supported devices in JustIN Mobile
> Find out which Android and iOS phones and their operating systems are compatible with the Salto JustIN Mobile app


## Supported operating systems {#supported-operating-systems}

The **JustIN Mobile** app is available on both iOS and Android devices and requires the following mobile operating systems to be installed:

### Android {#android}

- Android 7 (Nougat) or later version

### iOS {#ios}

- iOS 13 or later version
- [NFC unlocking](#nfc-unlocking) available on iPhone XS or later with iOS 17.4+ in the [European Economic Area (EEA)](https://en.wikipedia.org/wiki/European_Economic_Area)

{{% info-panel %}}
The JustIN Mobile iOS app is only available for iPhone.
You can't use it with Apple Watch.
{{% /info-panel %}}

## Unlocking methods {#unlocking-methods}

JustIN Mobile supports two unlocking methods depending on your device:

### Bluetooth unlocking (all devices) {#bluetooth-unlocking-all-devices}

- Works on all supported Android and iOS devices
- Requires opening the JustIN Mobile app first

### NFC unlocking (faster method) {#nfc-unlocking}

- Android: Available on all NFC-enabled devices
- iOS: iPhone XS+ with iOS 17.4+ in the EEA only
- No need to open the app (Android) or fastest unlock via widget (iOS)

For detailed information about using these unlocking methods, see the [JustIN Mobile user guide](/space/justin/user-guide#use-of-keys).

## Additional information {#additional-information}

The JustIN Mobile app is rigorously tested on a regular basis to ensure that it offers a secure and reliable experience on a wide diversity of devices.
If you're unable to find the app in [Google Play](https://play.google.com/), or you encounter performance issues, then your specific device may not have been approved to work with JustIN Mobile.