You can think of this problem in terms of utilization, the elimination rate of used electronic products is very high, except for Apple's some very good quality products: for example, the IPHONE4S has been used until now, the 6.13 version that has not been upgraded.
Android machines, on the other hand, get slower and slower due to inherent underlying problems, and then harder and harder to use due to problems with memory hardware.
For example, Samsung's font door machine, so this kind of machine has little value. Can only be disassembled to extract metal or obtain parts.
Instead of the parts of popular models, one is not affordable and one is idle for a very long time. Resulting in higher costs.
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Therefore, the acquisition of mobile phones is generally to take the way of low prices and low prices, and hand knives. It is recommended to sell old mobile phones directly to users.
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The dealer will not really pay you any \"high price\". Not to mention they have an unknown source of stolen goods purchase channels.