When the mobile phone is used for a long time, applications, garbage, cache and various files will take up space, resulting in insufficient memory. You can try the following methods to solve this problem:

If the mobile phone supports sd card, you can install an sd card and move files such as pictures, music and videos to the SD card.

You can also clean up the storage space and use the cleaning function in mobile phone housekeeper or file management to clean up junk files.

File management-> Clean up files-> Check the data to be cleaned-> clearmaster

Mobile phone housekeeper-> Space cleaning (or accelerated cleaning)-> Check the data to be cleaned-> clearmaster

If you still prompt that the memory is insufficient, it is recommended to back up important data and restore the factory settings of the mobile phone.