The phone card does not respond after the Samsung a7000 mobile phone system update

1. Confirm whether there is a problem with the SIM.

After restarting the phone and re-inserting the card, etc. to no avail, find a phone to confirm whether the SIM is broken. If it is on another phone, If there is still no response, the card is broken and needs to be replaced.

2. Confirm whether the mobile phone is faulty

Insert other mobile phone cards into the mobile phone to see if the SIM can be read. If not, the card slot may be broken, or there may be a problem with the phone system.

3. Upgrade the mobile phone system

Go to settings to check whether the mobile phone system is the latest version. Try upgrading the version first.

4. Restore factory settings

Another problem with the mobile phone that cannot read the SIM is that there is a problem with the baseband (a BIOS specifically responsible for communication). When upgrading the mobile phone system and flashing the phone, if the baseband is not flashed properly, problems such as poor signal or no SM card may occur. Before restoring factory settings, first back up important data on your phone, such as contacts, text messages, photos, etc. After backing up, you can go to the Settings Center to restore factory settings.