Samsung s4 can't make phone calls or send text messages.

The recommended operation is as follows: 1. Restart the phone to see if there is a signal problem. 2. Settings-Application Manager-Slide Screen Options (All)-Find Information-Click Enter, clear the data and try. 3. Try to replace another SIM card. 4. Check whether the mobile phone is equipped with security guards or third-party SMS software, and test it after unloading. 5. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings. If the above method still doesn't work, please send the machine to Samsung Service Center for engineers to check the machine.