Based on the data published by the Central Bureau of Statistics, the socio-economic level of the locality where the students are living and where the school is located is ranked relatively high, namely 8 out of 10 (10 being the highest rank). The principal requested to maintain the anonymity of the students and of the school. Hence, the name of the locality where the study was conducted was not indicated in the body of the work. This is the second year that the teacher has been teaching at that school. The 7th to 9th grades of the middle school number on average about 10 classes per age group. At this school the use of mobile phones is prohibited during lessons. For the purpose of the research the teacher received the authorization of the principal to implement smartphones while delivering the teaching unit.