The mobile phone can't read the SMS sent by the SIM card, and only shows unread but unreadable.

The system stability of mobile phone is not very good, you can try to turn it on and off. Otherwise, your mobile phone is infected with a virus. This mobile phone supports java, so you should have downloaded many programs online. General business mobile phones need to be upgraded. You can upgrade or kill virus. Either there is something wrong with the mobile phone line and you need to find a professional.