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The Cellular Mobile Trainer "ETM" operates in conjunction with a computer, which is connected with the ETM interface box through a USB connector. The ETM software allows the students to visualize in an easy way the AT commands sent and received to the SIM card to perform the different mobile phone services. The ETM unit allows to use the basic mobile services and visualize the steps needed to it, through the computer. The ETM unit also allows to study the management of the SIM card memory for SMS inbox, phonebook, etc.