I think it's better to be an apprentice with a maintenance master without paying tuition. Having a master to teach technology, you will never forget the solid technical foundation you have learned, and you can learn to be a man and do things for life. What the training school teaches is too general and written, so it is better to teach yourself directly, and it is difficult to learn skills. At present, almost all mobile phones have one person, and I think the prospect is immeasurable. The key depends on how you operate it. Good craftsmanship is the foundation, and price, morality and service are the most important. To win the recognition of others, people will introduce you to customers. Repairing your own mobile phone is also quite risky. If you accidentally hang up your mobile phone, you have to spend money to buy a new one after repairing it. This industry is still risky.