Casa is compatible with both iPhone and Android. However, due to how keys are stored on your device and backed up to the cloud, it's not possible to automatically retrieve the same Mobile Key and Single Key from a cloud backup on a different phone when you're switching from iOS to Android, or from Android to iOS.
The Mobile Key and Single Key must be restored on the same phone type (iPhone to iPhone, or Android to Android). This is because these backups are synced to iCloud (if you're using an iPhone), or Google Drive (if you're using an Android phone).
"What happens when I set up the Casa App in a different OS?"
Even if you can't pull the backup from your phone's cloud service, you can still transfer the key by using our QR code export/import feature.
See: QR Code Backups for Mobile Key and Single Key for step-by-step instructions on how to do this.
"What if I don't have the old device, and don't have access to a phone with the same OS?"
If you do not have your old device, and do not have access to a device with the same OS, then you can recover funds from your multisig keyset by initiating a recovery transaction using your hardware device in combination with the Casa recovery key.
You will not be able to restore Single Key funds without a new phone using the same OS.
"Can I opt out of using the Mobile Key?"
Yes! In the Casa App, you can optionally replace the Mobile Key with a second hardware device key.