Comment by dorkwood

This method unfortunately falls apart if you get a phone call from a hospital. They'll leave you a voice message, but when you call the same number back you'll get the front desk instead of the doctor who left you the message. They'll patch you through to the ward your Dad's in, but they won't be able to give out any information over the phone, so you'll need to wait for the doctor to call you back. They're out doing their rounds at the moment, but they'll get back to you as soon as they can.