Hi
I have found out that 1 option was a new mobile with more internal memory, because my previouse mobile with this issue had an internal memory of 150 mb & I still had this problem with the memory card.
It was not possible to free up space by deleting pre-existing files unleess I connected to the computer with the MobiMB application.
However I also saw positive comments about ftp.
I didn't try out ftp or ModiMB, however you must have backups & know what you are deleting because a pre-existing file may be a system file which might corrupt the system once deleted.
Thanks everyone