Mobile phone SIM card can not read how to solve the mobile phone SIM card can not read 5 kinds of solutions

1, to confirm whether the SIM problem

After the mobile phone restart, card reseat and other steps useless, find a phone to confirm whether the SIM has been bad, such as in other mobile phones are still no response is the card is bad, you need to make a new supplementary card.

2, confirm whether the mobile phone failure

Insert other phone cards into your phone to see if you can read the SIM. If not, it is possible that the card slot is broken, it may be a problem with the mobile phone system.

Don't rush to the repair shop, try the following methods to see if it can be solved.

3, upgrade mobile phone system

Go to the settings to see if the phone system is the latest version and try to upgrade the version first. Invalid please look down.

4, Restore factory settings

Mobile phone can not read the SIM there is a baseband (a dedicated BIOS responsible for communications) out of the question. In peacetime upgrade mobile phone system, brush machine, if the baseband did not brush well, there will be poor signal or no SM card fault.

In the restoration of factory settings, the first backup good mobile phone important information, such as contacts, text messages, photos and so on. A good backup will go to the Setup Center to restore factory settings.

5, mobile phone brush machine

Reboot the phone to see if the SIM card can be displayed. If you can not try the new brush machine, each model brush package is different, you can go to the corresponding official forum and professional website Download Brush package, brush the machine carefully before watching the tutorial.

Step One:

Turn off the phone, pull off the back cover, reseat the SIM card, and note the sim direction, as shown below:

Step Two :

If the correct insertion of the SIM card, the boot is still not recognized, into the system settings-sim card management, whether to open sim1 or SIM2, as shown in the following figure:

I'll tell you a few simple ways if it's not good!

First trick: Use a standard SIM card. First you should read your phone instructions and confirm which SIM card your phone supports. There are now three types of SIM cards in the market, sorted by size as follows: General SIM card >micro SIM card >nano SIM card. Strongly do not recommend the large card cut into small cards, a cut card size is difficult to accurately control, and then cut cards easily caused by SIM card chips and other damage, resulting in cell phone can not be recognized, loaded into the phone and may damage love machine, can be described as Penny Wise. So small series recommend everyone to the telecom, Unicom or mobile business Hall to replace their mobile phone support standard SIM card.

Second trick: Properly install the SIM card. Mobile phone SIM card is now installed on the phone a variety of ways, there are like the iphone's Cato, there are like the insertion of Samsung card seat type. It is strongly recommended that you carefully read the phone manual before installing, and strictly follow the instructions on the use of the manual, such as not to put the SIM card in the direction of the reverse.

The third trick: Ensure that the SIM card surface clean and no oxidation. SIM card contact with mobile phone card block is part of the metal, if the metal is oxidized or surface dirty, will cause SIM card and mobile phone card block contact is bad, resulting in no card recognition. The solution is very simple, you can use cotton balls dipped in anhydrous alcohol on the sim contact surface to wipe clean.

Four strokes: Replace the wear serious SIM card or have deformation and other damaged SIM card. SIM card after long-term use, the SIM contact surface metal coating will wear or SIM card deformation and other damage, and mobile phone card block contact is bad, resulting in no card. It is recommended to replace the new SIM card at the telecom, Unicom or mobile business Hall.

The five strokes: cautious brush machine, software update to mobile phone manufacturers official website. For some Android enthusiasts, often to try some of the new features of ROM, new style or new features of the brush machine, but after the SIM card can not be recognized. There are two ways of dealing with this situation:
1, brush back before you can identify the SIM machine bag.
2. Feedback this question to the author of the Rom, and ask the ROM author to help solve the problem of not recognizing the SIM card.
Ps: General normal mobile phone manufacturers, require users to the official website for system software updates, do not recommend the consumer to brush their own casually update, brush machine risks, do need to be cautious na ~!

PS: You can find your own friends around the phone, the secondary SIM card installed in the above, to see if there is still this problem, such as still cannot read, you can be sure that the SIM card has been damaged recommended to change the card business Hall! If you can read it is a mobile phone problem, it will be sent to repair!
Note: the cards need to be card holders identity card, then remember Oh!

According to your present description, suggest to send the hand machine repair shop to detect!