Next G1 problem - sending text messages

The next problem I ran into is sending text messages.  I believe this is due to my old AT&T Wireless (blue) SIM card.  I found instructions on how to set the SMS Center phone number.

Download Any Cut from the Market. Open Any Cut and click "New shortcut" Click "Activity", then "Testing", then "OK" Go to your home screen and click "Testing" Click Phone information Scroll all the way down *Where it says "SMSC:" ...

I found the AT&T SMSC number in the howardforums archives: +19078319301