Smart phone

[Anonymous]

Hi, I'm after a phone watch that works alone without another device. That is compatible with an o2 sim and works in the U.K. My kids only use their other devices at home and we need something for calling each other when they're out. There are a lot of smartwatches but all seem to need a phone with it and the ones I've found that don't seem to either not work in the uk or aren't clear about network compatibility. Thanks

[MI5]

The cheap Chinese ones that take a sim can be used without a phone and they all work with an O2 sim for calls and texts.
I'm not clear about what you mean for calling each other when they're out. ?