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Mobile phone reapring subject for need the basics electronic knowlage as well. Because mobile phone was made by electronic components used. The two types of electronic has in the mobile phon. It's ones are analog electronics and SMD electronics Anloge electronics are basically Ac devices used for the Analoge electronics. Example by Charger. Because it's inside operation is Ac current convert the DC current. So SMD electronics are the sureface mount devices because this type of electronic have two side of PCB layer .It's mean upper side and lower side both. And also need the soft ware and IT knowlage. Because mobile phone is basically connect in the internet. It's all ready works on the It and computing world.