hey guys if you want to wifi tether on att without root. I currently use this. You can use these directions to get it to work. The only catch is if att figures out that you are doing it Ive heard they will automatically put you on the 4gig tether plan at another $20 dollars a month again. you may be able to argue out of it. but like i said Ive been using it for at least 3 months and haven't had a problem or an extra charge.
Procedure:
Go to Settings > Wireless & Networks > Mobile Networks > Access Point Names.
Press Menu and select New APN.
Enter these APN settings:
Name: AT&T
APN: wap.cingular
Proxy: <leave empty>
Port: 80
Username:
WAP@CINGULARGPRS.COM
Password: CINGULAR1
Server: <leave empty>
MMSC:
http://mmsc.cingular.com
MMS Proxy: wireless.cingular.com
MMS Port: 80
MMS Protocol: WAP 2.0
MCC: 310
MNC: 410
Authentication Type: <leave empty>
APN Type: <leave empty>
Once you have setup this new APN, enjoy wireless tethering at no additional cost.
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Enable Free Wireless Data Tethering on AT&T Motorola Atrix 4G