Problem sending SMS message with hyperterminal

Hi,
I am trying to send a text message using hyperterminal and AT commands
Ex:
at
OK
at+cmgf=1
OK
at+cmgs="2107791679" (also tried at+cmgw)
> hello

When I enter "ctrl z" I get a little arrow after hello
and hyperterminal just hangs there. It doesn't respond or send the message. I have been successful using the other AT commands, as well as, dialing out using at commands.
Is there anything I should change to actually send the message? How long does it take for hyperterminal to send the message?

I'm using a samsung t809 phone because I could not get my computer to recognize the Nokia 6310i. I've spent so many hours trying to get this phone to communicate with my PC but to no avail.
Here are my specs on hyperterminal:
Bits per second: 9600
data bits: 8
parity: none
stop bits: 1
flow control: hardware (i've also tried none)

I'd appreciate any help. Thanks!

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http://www.picbasic.co.uk/forum/showthread.php?t=8431