I bought an Android phone from Sony Ericcson to use with my AT&T wireless carrier. I have now set up my device to use the data connection with tethering without rooting or installing any third party software on the device.
So, here are the settings:
First, go to Settings–> Wireless and Networks–>Mobile Networks–>Access Point Names
and from the menu choose +New APN.
Now fill in the details:
Name: You can choose on your own
APN: wap.cingular
Proxy: wireless.cingular.com
Port: 80
Username: WAP@CINGULARGPRS.COM
Password: CINGULAR1
Server:
MMSC:
MMS Proxy:
MMS Port:
MCC: 310
MNC: 410
Authentication type: PAP or CHAP
APN Type:
APN protocol: IPv4