Setting up Google Voice as your Voice Mail Box

After setting up your google voice account and phone number, dial the following code to forward your number.

Wireless Carrier or Network   —> Activation Code
AT&T Cingular, T-Mobile, GSM network: *004*1[GVnumber]*11#

Verizon (CDMA network): *71[GVnumber] AND *90[GVnumber] AND *92[GVnumber]

Verizon (TDMA Network): *74[GVnumber] and *73[GVnumber]

Bluegrass Cellular: *90#[GVnumber] and *92#[GVnumber]

Cellcom: *68[GVnumber]

Cincinnati Bell: *004*[GVnumber]#

US Cellular: *74[GVnumber]

 

Reference: Google Product Page