✔ 最佳答案
Nokia 6230 is S40 with 6 MB shared memory, can store 150 short messages, 16 voice commands, 25 voice dial slots and 3 min voice memo inside the phone.
By meaning of Shared Memory, if you have spent memory on Java, MMS, Ringtone or Pictures, it is actually using up the internal memory (that 6MB).
Therefore, instead of deleting all SMSs (up to 150 SMS), which is about 2Mb... maybe you can delete a pic or ringtone instead to free internal Shared Memory for the phone.
Hope it helps~