Upgrading to the iPhone 3G S

Before upgrading, I upgraded my old iPhone to 3.0 and synched,

The upgrade process was simple, call the 866 phone number, enter your
phone number, zip code and other security info, turn off your new 3G
S, wait 5 minutes, turn it back on and tether it with iTunes to
restore your backup.

Some issues:

• On one of the phones that I upgraded, I had to call AT&T to select a data plan. The phone worked, but the 3G and text messaging services did not.
• On another phone, the text messaging only did not work. I also had to call AT&T.
• On one of the early upgrade phones, the upgrade process went smoothly.