There are a number of checks that we perform to find out if a device is jailbroken, but unfortunately, these cannot be verified by our users.
How to check on iOS:
1. Launch Safari on your iOS device.
2. In a new Safari tab, type in 'Cydia://' and hit ‘Go’.
3. If you have Cydia installed, then Safari will offer to launch the application. This will prove that your device is Jailbroken.
How to check on Android:
In order to check for yourself, you can use a root checker app; this will confirm whether your device is jailbroken.