Should go to Shenzhen China directly to find Reliable Refurbished Cellphone Manufacturer?

Shenzhen is the largest electronic market in China. And it attracts increasing foreign buyers to visit every year. But how to find a  Reliable Refurbished Cellphone Manufacturer? Also, where do those purchasers mostly go?  The answer is Huaqiangbei, namely Huaqiang Bei, or Hua Qiang Bei, or Huaqiang north. It is the name of a road [...]