If I buy a second hand mobile phone, can the previous owner still find out what the phone uses?

If the used phone has been factory reset before the second sale.

Then the original owner will not be able to find out the current use of this mobile phone.

After buying a second-hand mobile phone, the previous owner generally could not find out what the mobile phone used.

Second-hand mobile phones are generally processed, and many of the application content in the mobile phone has been deleted, and the previous owner can no longer query the mobile phone.

It is impossible for you to buy a second-hand mobile phone, generally second-hand mobile phones will be processed, such as carboxyl, so even if it is the original owner, it is impossible to know the usage record of this mobile phone.

If you buy a second-hand mobile phone, then it is impossible for his previous owner to find out what the current phone is using. Because the ones you use are different, even if it's a mobile phone number.

What do you want to do, are you going to give it back to him? Generally speaking, it is unlikely, because the original owner of the phone, before selling the phone, he will restore the original factory settings, and the personal things in the phone will be completely deleted. Someone who can reply That's an IT master.

When buying a second-hand mobile phone, you must pay attention to log out of the original account first, then restore the factory settings of the mobile phone, and finally log in to your account, so that there are no other hidden dangers.

After buying a second-hand mobile phone, the previous owner can still find out the content of the borrowed mobile phone, definitely not, because the second-hand mobile phone has been emptied at the beginning of menarche.

As long as you format it after you buy it, there will be no software that will be able to monitor the content of your smartphone.

If there is no exit in the mobile phone, you can enter the background of the brand mobile phone to find it.

The exit is coming, and it is impossible to view.

Check whether the appearance is damaged, whether there are traces of dismantling and repair, check the main functions of the phone, and see if it is original. If you really don't understand, you can go to the 58.com platform to find someone for testing. Access to real, comprehensive information about on-premises services

When you get the phone, first look at the wear and tear of the appearance, and then press the screen with your hand, if there is a watermark, it means that it is not the original screen, it is a refurbished machine. See if there are obvious scratches on the appearance of the mobile phone, whether it conforms to the color described by the seller, take it to the mobile phone and touch the feel, the genuine frosted effect feels delicate and symmetrical, and the feedback of the button feel is timely, not light or heavy, not soft or hard. Secondly, regardless of buying and selling, you must take a photo before sending it, and unpack it in front of the courier after receiving the goods, or record unpacking**, of course, this is for platform buyers, because no one knows whether it is the seller's intention or the express delivery problem.

If the merchant's ** is too different from the official website of the mobile phone**, you should be careful, too cheap mobile phones are very suspected of being refurbished or problematic mobile phones. Don't be greedy for cheap phones that are significantly lower than the market**.

58.com] builds a platform for free communication between the two sides of second-hand mobile phone transactions, providing users with a larger communication space and greatly increasing the user's trading experience. Free communication gives users plenty of choice. On the **, the buyer has the initiative to negotiate and has an advantage.

Here's how to see if a second-hand phone is original:

1) Look at the serial number (IMEI).

Enter * in the standby state of your phone and write down a string of numbers that appear on your phone. Remove the battery and look at the serial number on the white label (case serial number) in the two labels on the back of the fuselage, and the other label is generally the network access license.

See if the serial number is the same as the previous number.

Then look at the IMEI number on the box of the machine.

Compare the three to see if they are all in common, and if not, then it is very likely that the machine is being repaired or assembled with parts. If the three numbers are the same, it means that the mobile phone is **, not a refurbished phone.

2) Look at the phone case.

The inner screen, outer screen, camera head, etc., only need to touch these parts, and fingerprints will be left. Look at the gap between the upper and lower shells of the machine, the open space around the keyboard, and the charger slot, etc., to see if there are any dust and traces of use. The shell of the innovative machine is generally made of imitation of the original or old shell, so the front and rear parts of the shell are very simple and not tightly closed.

3) Look at the outer packaging and instructions of the machine.

The packaging and instructions of the regular new machine are printed exquisitely, and the fonts and pictures are very clear and hierarchical, while the counterfeit packaging boxes are mostly simple and single-sided paper, and the imitation fonts and drawings are very rough and the printing handwriting is vague.

4) Look at the phone accessories.

The new machine of the regular manufacturer has a full set of original accessories, at least one battery and one charge, the accessories of the innovative mobile phone are generally not completely or not the original, it is best to understand what are the standard original accessories, if you find that there are scratches on the plug of the matching charger and headphones, then the mobile phone is also very likely not to be brand new.

5) Warranty period.

Second-hand mobile phones cannot enjoy all the rights and interests stipulated in the "three guarantees" of regular mobile phones, so there is generally no warranty period or the warranty period is relatively short. If the seller says that they are responsible for the warranty, they can't agree, because regular mobile phones are generally guaranteed nationwide.

No. Generally, the resale of mobile phones will be restored to factory settings.

At this time, there is basically no information on the mobile phone, and even if you insert the card, the original owner will not know your mobile phone number, rest assured!

Generally, it can't, because there may be no information to see through the ** number, because it is a second-hand mobile phone, and the following situations may cause information leakage.

Second, the phone has a Trojan virus.

Therefore, for second-hand mobile phones, it is recommended to disinfect the mobile phone after getting it, and reset the mobile phone to avoid information leakage as much as possible.

After changing to a new mobile phone, can others still check the data of the old mobile phone?

Hello dear, it's a pleasure to serve you! As far as I understand your question, there are the following suggestions: Dear, if you change to a new phone, then the data in the old phone will not be moved to the new handheld computer with your replacement, and only if you have backed up and restored the data of the old phone on the new phone, you can view the data in the old phone in the new phone.

Dear, if you give your old phone to someone else or erase it without taking appropriate measures to protect your privacy, someone else may be able to view the data in your old phone. Therefore, in order to ensure your privacy and security, it is recommended that you log out of all applications, erase all data and restore factory settings when you change your phone, and make sure that your personal information, account information and information about yourself have all been erased, and you also need to pay attention to deleting all stored data in your old phone to ensure that your privacy information will not be leaked.