Yes. While the watch will connect to WiFi, a SIM card is required for device registration and most functions and allow it to work when out and about.
For US and UK customers, Angel Watch provides the option to use AT&T or T-Mobile (USA) or EE (UK). There are no contracts or any risk of overages.
International customers can use just about any GSM worldwide 4G network. Visit our Cellular Networks & SIM cards section to learn more.
With a SIM card, the watch will have its own number and data service connecting right to your Angel Watch app regardless of location. You'll be able to see your child's location, give them a call, send them a message, and always give them a way to get in touch with you too.