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Is the intercom function of children's watches charged by SMS or by traffic?

Intercom voice is traffic, and calling is charging. Just open a package with 30 megabytes of traffic and a certain call duration. Smart children's watches are controlled by mobile app. You can see that your child's watch is bound to the management account. For example, 360 smart children's watches, through the control of mobile phones, parents can know the children's dynamics anytime and anywhere. One-way call does not affect children's study or play.