Storage of incoming messages
When you have an incoming text message and your phone’s
memory is full, one or more low-priority messages, which
have been read, will automatically be deleted in order to
receive the new text message. Messages are usually deleted
from your Inbox, but an emergency message may cause
messages to be deleted from the Saved folder.
If the message memory is still full, your phone will display
No space: message waiting. You can clear this notification
by pressing OK. You should delete one or more old messages
to make room for the new message. The network will re-send
the message at a later time.