My son has a group of 5-6 friends who all play in the park, gardens and street around their houses.
I would like some way for him to communicate with me/me to contact him if required.
I would rather not go down the mobile phone route as I think he’s still too young.
What are the other options and can you recommend a specific watch/other item and SIM card?
I’m finding the SIM card particularly confusing.