1, software problems such as cell phone jailbreaking, unlocking and accessing can be learned in 15 days.

2, understand the circuit diagram and general disassembly, this level only takes about 1 month to learn.

3. It takes about 2 months to understand the circuit diagram and simply repair the mobile phone.

It takes three months to understand the circuit diagram and reach the level of a general skilled master (the master leads the door).

5, there are more advanced, to become a top mobile phone maintenance engineer, we must rely on our own efforts and learn endlessly. (Practice depends on the individual)