Selling original iPhone - procedure questions

Question

Hello, I recently switched from the original iphone to a Droid X and Verizon. I now would like to sell my original iphone, but I have a few questions.
*_So far I have:_*
Ported my phone number over to the droid x (verizon)
Canceled my at&t account and received my final bill
Did a full data reset (Settings/general/reset/erase all content and settings)
Removed my phone number from the phone (Settings/Phone/My Number - cleared my number and entered in a + and hit save. My number now does not show on the phone or in itunes)
Did a network reset (Settings/general/reset/reset network settings)
Reboot
Now when I turn the iphone on it says waiting to activate.
Questions:
1) Is there anything else I need to do to remove all my personal data and old at&t account settings?
2) In itunes, do I need to do: deauthorize this computer?
3) Once I sell the iphone, what does the person buying it need to do to activate it and sign up with at&t?
4) Is there anyway the person buying it would be able to activate an account in my name, which obviously I don't want? (is the phone still tied to me somehow)?
Any answers you can provide will be much appreciated. Thanks.

Answer 1

1) Is there anything else I need to do to remove all my personal data and old at&t account settings?
Using the erase all content and settings option on the iPhone does exactly as provided and is a secure erase except for the firmware/OS and included apps, so there is nothing else you need to do.
2) In itunes, do I need to do: deauthorize this computer?
Only if you no longer plan on using this computer with your iTunes account with iTunes, which does not require an iPhone.
3) Once I sell the iphone, what does the person buying it need to do to activate it and sign up with at&t?
If they will be a new AT&T subscriber, they will need to get a new SIM card from a local AT&T corporate store to activate the iPhone which can be done at the AT&T store or with iTunes on their computer. If they are an existing AT&T subscriber, they should be able to use their existing SIM card being used with another phone or get a new SIM card from a local AT&T corporate store to activate the iPhone with their line/number with iTunes.
4) Is there anyway the person buying it would be able to activate an account in my name, which obviously I don't want? (is the phone still tied to me somehow)?
No.