"Yes, you should know by now how to use it, right?" Fein smiled.
Hearing his question, Roger shook his head bitterly, "Not really. This thing you gave me seems a little complicated to use. There are a lot of unfamiliar things even with the instruction manual."
"Well, Let me teach you then..." Fein walked beside Roger and took out another phone and started to explain the functions of the mobile phone attentively.
Just like how he taught Kassandra, he also patiently demonstrated each of the applications use to the point that even elementary students on Earth would understand.
Roger just kept nodding as he listened attentively. His eyes shined over time as he became more familiar with the use of the phone.
'This thing would revolutionize the aspect of communication in the future!' Roger's eyes turned serious.