it doesn't give much clue in the manual
Quote:
When one of the following notes is shown, the phone memory is low and you must
delete some data:
• Not enough memory to perform operation.
• Delete some data first.
• Memory low. Delete some data.
To view what kind of data you have and how much memory the different data
groups consume, select Menu > Tools > File mngr. > Options > Memory details.
You may want to delete the following items regularly to avoid memory getting low:
• Messages from the Inbox, Drafts, and Sent folders in Messaging.
• Retrieved e-mail messages from the phone memory.
• Saved browser pages.
• Images, video clips, and sound clips in Gallery.
If you want to delete contact information, calendar notes, call timers, call cost timers,
game scores, or any other data, go to the respective application to remove the data.
If you are deleting multiple items and one of the low memory notes is shown again,
try deleting items one by one (starting from the smallest item).
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as it sounds like you have already done that - after that the option is to reset to factory default, but you'll lose all your data, that way
