2. The source of the mobile phone-is it licensed or parallel?
3. Functions of mobile phone-Do you really have some functions you need?
4, price-there are many stores that are inconsistent with the actual price, or some different packages, you have to ask clearly.
5. Accessories-What accessories are included in the mobile phone you bought? Some shopkeepers don't include accessories in the price tag of their goods in order to rank high.
6. Others-In addition to asking the shopkeeper the above questions, you also need to study the credibility of the shopkeeper and the evaluation of others in the past. You should look for similar products with high credibility, multiple transaction records and good comments from other sellers. If necessary, you can even find other buyers who have bought similar goods from the owner to verify the situation and understand the quality and service of the owner's goods.