The phone has a card inserted but shows no service

The reasons and solutions for why the phone has a card inserted but shows no service are as follows:

1. Confirm whether it is a SIM problem. After restarting the phone, re-inserting the card and other steps to no avail, find a phone to confirm whether the SIM is broken. If there is still no response on other phones, the card is broken and the SIM needs to be replaced.

2. Confirm whether the mobile phone is faulty. Insert other mobile phone cards into the 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 way in which the mobile phone cannot read the SIM is that there is a problem with the baseband. 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.

5. Flash the mobile phone. Restart the phone to see if the SIM card can be displayed. If you can't try to flash the phone again, the flashing package is different for each model. You can go to the corresponding official forums and professional websites to download the flashing package, and watch the tutorial carefully before flashing the phone.