First of all, we need to know what services can bring the profit.
1. Repair the cellphone
2. The phone related accessories
3. SIM card
5. Buying And Selling of used cell phones
6. Selling new phones
Second, select a suitable store location or have a good website. This is related to the store traffic and influence, you need to let your business be known, and then the customers will find to you solved the problem.
Third, you must have the professional mobile phone repair skills and knowledge or you have the tech support, this is the most important step for your phone repare business. When you receive a client, you need to know what's the problem of the cellphone, and repair the cellphone in time. If the issues of cellphone are more complicated, then you can tell your customers need to wait 1-2 days. On the other side, you should have some stock about the phone replacement parts, such as the LCD displays, microphone, speaker, and so on.
Fourth, you should have the high-quality phone repair tools, such as the Nand test fixture, microscope, phone opening tools and so on. These devices are an integral part of your cell phone repairs. All of this device, you can find it in Vipprogrammer.
Fiveth, you can recycle old phone/ broken phone, then you clean it or fix it, you can sell it with lower price, but you can still make a profit from it.
Sixth, sell the new phone, because you have a professional mobile phone repair shop, many customers will see your mobile phone, and they believe you will have a good after-sales service, and when their broken phone need pay too much to fix it, maybe they will consider to buy the new phone.
Lastly, you need a strong sense of smell to keep understand and explore new trends in mobile phone industry, and it will keep you from being eliminated. Also, you need to learn more phone repair knowledge to make sure you can solved the 90% of the phone issues.