I currently have a 2gb memory card in this phone
Most of the time, this works fine and can accept lots of messages etc...
However, sometimes it says that my memory is too low to send or receive messages
Even after I have deleted all the songs on the phone, all of the photos and all message in the inbox and sent and outbox etc... it still says i have no memory

does anybody know why this happen?

as i have said, it only happens sometimes, normally for about a day or two
this time, its been like this for 4 days so far

thanks

It must be run out of RAM memory. Try stop the applications which run in background and restart the phone. It should gain you back some free RAM memory.

thanks, but even if i restart my phone it still says that my memory is too low.
is it recommendable that i have to reformat my phone memory?

Format would be the final solution.

salamat ng marami! (thank you so much!)

try to use some app for compct RAM. i use this programs for many years in all by devices with symbian. this apps also can stop other apps to empty RAM.
but it is not the same like app switcher from nokia....

You did'nt mention the model of your phone but if it is a nokia v2 or v3 edition,try rebooting and while it reboots hold down the ABC button or the pencil button untill it welcomes you. That's called safemode.