1. to know the behavior using a Smartphone phone teen Thailand.2. to know the negative impact of the use of sat Smartphone calls.3. to determine whether a child has phone next Thailand.
1. To note habit of using mobile smart phone of teenage Thailand 2. to recognize the negative impact of the use of telephone, smart phone 3. to know that Thailand's next phone. How much rates
1. To determine the behavior of smart phone in teenagers 2. To know the negative impact of the smart phone 3. In order to know the children on the phone rate.