Users attempting to AT&T
APN: wap.cingular
Username: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Password: CINGULAR1  

APN= wap.cingular
Username= {Blank}
Password= {Blank}
MMSC= mmsc.cingular.com
MMS Proxy= 66.209.11.32
MMS Max Message Size= {Blank}
MMS US Prof URL= {Blank}  

OR 

APN: wap.cingular
Username: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Password(case sensitive): CINGULAR1
MMSC: mmsc.cingular.com
MMS Proxy: 66.209.11.32
MMS Max Message Size= {Blank}
MMS US Prof URL= {Blank} 

Tmobile: 

internet:
APN: internet2.voicestream.com
Username:
Password: 

mms:
APN: wap.voicestream.com
Username:
Password:
MMSC: http://mms.MSG.eng.t-mobile.com

or
MMSC: 216.155.174.84/servlets/mms
MMS Proxy: 216.155.165.50:8080
MMS UA Prof URL:  

 here it is:

Verizon, @vzpix.com

AT&T/Cingular, @mms.att.com

T-Mobile, @tmomail.net

Sprint/Nextel, @messaging.sprintpcs.com

Virgin Mobile, @vmobl.net

Amp’d Mobile, @vzwpix.com

Alltel, @message.alltel.com

Metro PCS 1 @metropcs.com

Metro PCS 2 @mpcs.com  

You net to click ON Data Roaming