There are many mobile phone wholesale markets and dealers in Shenzhen. You can find cheap mobile phones through the following channels:

- Shenzhen Huaqiangbei Electronics Market: This is one of the largest electronic product wholesale markets in China. There are many mobile phone wholesalers and dealers, which can provide mobile phones of various brands and models.

- Shenzhen Yuanwang Digital City: This is one of the largest mobile phone wholesale markets in Shenzhen and one of the well-known mobile phone distribution centers in China. There are many mobile phone wholesalers and dealers.

- Shenzhen SEG Electronics Market: This is one of the famous electronic product wholesale markets in Shenzhen. There are also many mobile phone wholesalers and dealers.

- Online wholesale platform: You can also find mobile phone wholesalers and dealers in Shenzhen through online wholesale platforms such as Alibaba and JD.com, and compare and choose.

It should be noted that when choosing a purchase channel, you should pay attention to product quality, price, after-sales service, etc., and choose reliable wholesalers and dealers to ensure your business interests and customer satisfaction. At the same time, you must also comply with relevant laws and regulations to ensure the legality and compliance of the goods you import.