Always take a phone when hacking purely for emergency reasons. You never know when an accident is lurking around a corner and you need emergency help. Also, we have a remote access gate and when there is power failure, we need to contact the grooms to unlock the gate so we can get back into...
My horse has never lost a shoe in the middle of a cycle, either just after shoeing or just before he is due. He lost a shoe 3 days after and my farrier was unable to get out to put it back on so he arranged for another farrier in the area (who shoes 2 horses in my yard) to replace it for me...