Nokia 5.3 has three categories of ram: 3 GIG, 4 GIG and 6 GIG
You can check your product's packaging. It will have the details on the label about the storage and memory configuration that you have.
You can also check the total RAM usage within Developer Options of your Android smartphone. Go to Settings => System => Developer Options => Memory.
And you will need to enable Developer Options if you haven't enabled them already.
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