I have been getting the same message, for 6months now. I have tried taking out my SD card. I have cleared everything out everywhere. Deleted all kinds of everything to try to make room. Uninstalled apps. I have done everything except take my phone down to factory reset. And NOTHING seems to work.
You asked for model number, carrier, and something else.
Metro by T-Mobile
Android version 9
If you need anything else, please let me know.
mod edit: removed personal email address
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