The memory capacity of the device can be different depending on the model. With frequent models, you often have 3 or 4 versions of memory capacity. This is expressed in Gigabyte (GB) or Terrabyte (TB) .
On the original box of your device, the memory capacity is mentioned.
Using the EAN number, most search engines will also tell you which memory version you have.
You will also find an indication of this in the device's settings under 'memory'.
The most common memory types are 16GB, 32GB, 128GB, 256GB, 512GB or 1TB.