Enter kids smart watches ... Usable with any compatible SIM card, there are no extra monthly costs – you just pop in the SIM, and off you go. Parents can control the watch via an app and ...

Featuring a built-in 4G SIM card ... the Vtech Kidizoom Smart Watch DX2 hits its age bracket target dead on. Aimed at the older end of the kids' market, the Garmin Vivofit Jr.3 may be pushing ...