1. Understand what you're buying. Too many people buy an iPhone lookalike and expect it to work exactly like an iPhone. The truth is, it will never work exactly like an Apple iPhone, hence the reduced selling price.
2. When buying an unbranded smart phone, look at how much detail the seller included and how much effort he has put into the listing. Does the listing look like a rush job? Than probably the seller won't provide you with detailed customer service.
3. Look at the seller's listing photo. Does it look like a copy and paste job from some other website? Did the seller took his time to include several photos so potential buyers could look at the phone from various angles? Remember, "a picture says a thousand words" and if a seller's photo is sloppy, chances are that he does not take his business or products serious.
4. Never hesitate to ask for further clarification from sellers. A serious seller will respond to your questions promptly and thoroughly. If the seller doesn't bother to answer your question or provide vague answers, just think what will happen when something goes wrong after you bought the item.
These are just a couple of tips to think about when buying unbranded smart phones. It is a fallacy that all items produced in China are of bad quality. Usually, it is the sellers who are dishonest and they are only interested in making a quick buck. So, if you're going to buy an unbranded smart phone, make sure that you buy from a seller who appears to be serious and takes pride in his listings. In this way you can be half assured that you are buying from a seller with a heart and one who cares about his customers.