The Watch Only Supports T-Mobile Nano-SIM Cards with Prepaid Mobile Phone Plan not for wearables Geo-Tracking: These smart watches function as a GPS tracking device for kids. The GPS watch for kids has safe zone options and can update an android or iPhone compatible app for parents Safety: The kids GPS watch comes with a locator, SOS button, and calling so that when theres emergency activity, the child is never out of reach, even at school or when with friends. White List feature requires saving numbers in +1 XXX XXX-XXXX format Designed for Kids: These 4g smart watch for kids are easy to wear and durable enough to stand up to roughhousing, unlike a traditional smartphone. Its a cool alternative to child phones Touchscreen: With this children smart watch touch screen, kid's can easily call or text programmed numbers, use the camera for pictures or video, and see the pedometer Compatibility: This smart watch GPS tracker for kids comes with an iOS and Android compatible application to track the children and using features like the listening function