Depends on the kid!!! Age, maturity etc. I have a few (kids), and the eldest has been fine traveling since he was 16.
But, life tip: let them go!
Funnily enough, you are no doubt aware of my previous employment!! Have my voice recorder and trace software ready!!Just learn a special set of skills
Seriously though just set the rules when and why you would like a call, and tell them to enjoy themselves.
Think you and I are from same mould Dean, trust no one! I have the itinerary, travel details and names of booked hostels etc etc. The standing joke is that I fit a personnel tracker in her arm when she's asleep ala Jason Bourne. Lol.