First of all if your cell phone provider is not At&T or Cricket wireless you will need to Activate a new line which is about $49 and pay $30 to $35 per month. Once you do that then all you can do with the Doki watch is make basic calls just like a $25 cheap watch for kids.
What Doki claims on their website and ads it not true the watch doesnt work and the technical support is only through emails and they take 1 to 5 days to respond with the most minimal info that doesnt solve any issues your having with the Doki Watch.
The watch has to be on a Wifi to make video calling and it will not locate you kids unless your near a wifi that your loged on. Save your money. The Doki watch performes the same as the cheapest watch you can find.