Just Thought I would tell everyone that I have got this to work with the Cellular One, apart of the Dobson Cellular. Thanks to paulbblc for supplying the APN,

apn = cellular1wap
username/password leave blank

I then used this information with the origonal post here and placed the cellular1wap into the extra control command for the modem using the cingular blue as a "template"

Cingular Blue/AT&T Users (Success!)
+cgdcont=1,"IP","proxy"

In place of "proxy" put "cellular1wap", while working with paulbblc he finaly got his to work using the TMobile as his template

TMOBILE USA Users (Success!)
+cgdcont=1,"IP","wap.voicestream.com","",0,0

again in place of "wap.voicestream.com" he used the "cellular1wap", I'm not sure if he tried the Cingular control code so the 0's at the end might not have any effect... Don't know

Last thing we used the *99# for our dial up number, and leave the username and password blank. It won't be fast, but it does work.