Since 2011, many friends from USA, Euro and other countries sell broken screens about iphone and Samsung to China. This is a good business. The prices for buying broken screens in USA, Euro, Japan and many other countries are very cheap. Maybe you buy a screens for iphone 6s just need 10 US dollars in German, but if it is grade A and sell to China, the price is 80 US dollars. Do you consider there is a good profit?
If you want to start this business, you can find a co-operator in China, they can help you sell them or refurbishing them, and you just need to collect and buy the broken screens in your country. Then you can take the screens to China, or send them via fast express such as DHL, UPS to China.
The most important thing is: How do you know which screen is good, and which one is bad. You need to learn how to test the screens. It is very easy to learn, just for some hours, you will become very professional.
Please contact us if you are doing this business or want to start this business.