There is a circle on the j3 signal icon of Samsung Galaxy. How can I recover if I can't send text messages or make phone calls?

If you need to restore the phone to factory settings, please refer to the following: 1. Back up your important data, contacts, photos, memos, etc. 2. Setup-Reset-Restore the factory settings (. After the operation is completed, the machine will automatically restart. Note: If the phone has a screen lock password, you may need to enter the screen lock password when restoring the factory settings (the phone cannot restore the factory settings through the computer).