Why does my mobile phone always show that the SMS storage space is full?

The mobile phone always prompts that the SMS memory is full for the following reasons:

The mobile phone is not a smart phone, and there is an upper limit for storing information.

Take the smart phone as an example, downloading too many apps and uninstalling the garbage generated by the software leads to the state that the SMS memory is full. You can back up and restore your mobile phone.

Factory setting

Open the phone menu, select Settings, then turn on Reset and select Restore Factory Settings.

Automatic restart completed.