nokia & AT modems

Hi,
I have small problem with reset of commands in AT connection.
Here is my problem:
I send AT+CMGS="cell numer",129 to start command to sending message to "cell
numer"
Nokia send to me promt:">" and i have to write text of message and at finish
send CRTL+Z.
What i have to send to break this command(break message writing) and back to
reset AT modem and send new another commands. I can't escape from message
writing. Always I have to send CTRL+Z to work with next commands but this
operation is trying to send message but I want to escape from sending.
Is maybe command to reset AT connection?

Regards

Arti