What does this mean: with 20MB of memory which is expandable up to 4GB?

Question

This is the description of the phone:

The Nokia 6500S attractive slide opening 3G phone will catch your eye on looks alone. It comes with a large 2.2 Inch high color screen & with 20MB of memory which is expandable up to 4GB. The Nokia 6500 Slide has an integrated FM radio, 3.2 mega pixel camera & a video record with zoom feature.

I'd like to know what it means by it having the 20MB of memory which is expandable up to 4GB.

Thanks to anyone who helps. Best answer gets those 10 points!!

Answer 1

it means the phone comes from the nokia factory with 20Mb of memory. Expandible up to 4GB means that you can add more memory to the phone by buying a memory card (microSD or miniSD) and putting it into the phone. These memory cards come in different memory sizes from 256MB, 512MB, 1GB, 2GB and 4Gb. whichever you buy the original 200MB is extended. simple!!1

Answer 2

it means you can have up to a 4GB SD card that you can put into it