problem with at commands

hi, im creating a program that can dial number from PC To phone..

i use MSComm1

this how i open a comport
VB Code:
MSComm1.Settings = "9600,O,8,1"
If Option1.Value = True Then MSComm1.CommPort = 1
MSComm1.RTSEnable = True
MSComm1.DTREnable = False
MSComm1.PortOpen = True
and im having a problem with this line
VB Code:
MSComm1.Output = "AT " & (Text1.Text) & vbCr
in the Text1.Text i enter a Number e.g 1234567890 and then i have a button named DIAL when i press the DIAL the number i input n the text1.text i want this to appear in the mobile phones...

btw, im using Nokia 3310 Mobile phones...

br,