Step 8: Begin your Google Voice port
Let's recap. The number previously associated with your land line is now the phone number for your little GoPhone. You've verified this by receiving calls to your former land line's number and by making an outgoing call and confirming the right phone number shows up on caller ID.
You also made sure to get your GoPhone's account number and have that written down somewhere, where it's easy to pop into a Web form.
Congratulations! It's time to port to Google Voice. Go to google.com/voice. ** Make sure you're logged into your new Google Voice account, not your general Gmail Google account! **
Google Voice will ask you if you'd like to port over a phone number. Note that there's a "Google Voice Lite" that does not involve a ported phone. Ignore this.
Tell Google Voice the number of the phone you want to port (your former land line number, now residing on the GoPhone), and the account number you extracted earlier from the AT&T rep (see Step 5). Then pay Google $20 via Google Checkout. At this point, if everything's going well, you wait.
Step 9: Wait, and obsessively check port status
This process will take approximately 24 hours. We did not find it worked any faster than 24-hours and, in fact, it seemed that the number became a Google Voice number at just about the 24-hour mark.
Step 10: Link your Google Voice number to your cell phone
Your final step, before you can have voicemail and the other elements of Google Voice working, is you'll need to link your new Google Voice number to your cell phone.
Take note of an important limitation here: you can link only one Google Voice number to a given phone. You can also not link one Google Voice number to another Google Voice number. There is a way to consolidate these numbers, and I'll discuss that in a future article in this series.
In the meantime, go ahead and link the phone to your Google Voice account.
One final tip: for some reason my Google Voice account did not know my time zone. If yours is incorrect, go to the Account tab in Settings and change the drop-down menu to the proper time zone.
Congrats! You've now rescued your land line number!