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Buy a Sim card with your preferred provider
Make sure you have 2G network where you live (It wont matter if the Sim card works in your mobile, because they use 3G and 4G)
The Sim card needs a little bit of SMS, DATA and TALK, in order to work.
The watches is tested on children, but the screen can break like a mobil, if you are unlucky
Remember to set the GPS location service on 10 minuts or an hour, so the watch don't use the battery to quickly