Problem:

The actual available memory of my phone is less than stated.

Cause:

The memory stated on the marketing materials is the total memory, while the actual available memory is the remaining memory after deducting the part of the pre-installed system and apps from the total memory. This is common practice in the industry. Thank you for your understanding.

Read-only memory (ROM):

Available ROM = Total ROM - Storage allocated to the firmware - Reserved storage (to keep apps running properly when the storage is full)

Random access memory (RAM):

Available RAM = Total RAM - Reserved storage for the system and apps.