If either of the following messages is displayed when you are deleting several items at the same time, delete items one by one, beginning with the smallest items:
Not enough memory to perform operation. Delete some data first.
Memory low. Delete some data from phone memory.
Move content that you want to keep to the mass memory, a compatible memory card (if available), or to a compatible computer. If possible, install applications to the mass memory or memory card, rather than the device memory.