1. Determine the model and configuration of the required card machine, and you can query relevant information on the Internet to grasp the market conditions and prices.
2. Search for qualified second-hand Sony card landlines in second-hand trading platforms and other places, and check the relevant information provided by the seller, such as the status, use time and quotation of the card landlines.
3. According to the status and use time of the card machine, conduct on-the-spot inspection and test, including startup, call, SMS, reception performance, etc. Ensure that the machine has no obvious damage, intact appearance and normal function.
4. Confirm that the invoice, warranty card and accessories of the card landline are complete, free from pollution and damage.
5. When buying a second-hand card landline, you should choose a seller with high credibility to ensure the security of the transaction. You can communicate with the seller to understand the seller's reputation and after-sales protection measures.
6. Evaluate the price before buying and negotiate the price with the seller to make it affordable and reasonable.
7. After purchase, properly keep the information such as the instructions for the use of the card landline and the warranty card to avoid loss or damage.