I would like to cause an alarm on a remote iphone/android device when the app is running or not running.
How do I achieve it ?
I can only think of Whatsapp/Skype when there is incoming call, its ringing. Or would it be possible to cause the phone to play a looping alarm sound on Push Notification.
Another very clear example is "Find My iPhone" app which can trigger a loud alarm to an iPhone.
How can I achieve this programmatically on ios and android ?