Hi Ghizah,
The MMC slot on the 3250 is well hidden... I took me for ever to find it.
When you go into organiser and remove memory card it doesn't physically do so. All it does is closes any application that may be using the MMC at that time therefore preventing any damage to the MMC or handset.
Now to answer you question...
If you twist the bottom half a quarter turn and then look at the underside of the handset you will find a small symbol for the memory card. If you then look at the front of the handset and then down to the extreme bottom left corner (below menu key) you will find a small groove. If you take you nail and push down and away from the handset you will be given access to the memory card slot.
There is something to be learned from a rainstorm