Error message "Memory full. Close some applications and try again"

[meastwood98]

HI, ive just got a 6680 on o2. Im having problems with it saying "Memory full. CLose some applications and try again". I can solve this problem by turning the phone off and on again but i dont want to be turning it on and off 3 times a day just so i can use the camera, internet or an application. How can i solve this problem? im using firmware v3.14. Another thing i dont understand is when i use my camera it says i have only 11 photos left and 5.47minutes on video left. But surely since my phone is brand new i should have more. Im using a 64MB standard mem card. Help any1? Cheers in advance