T-Mobile: phonenumber@tmomail.net 
Virgin Mobile: phonenumber@vmobl.com 
Cingular: phonenumber@cingularme.com 
Sprint: phonenumber@messaging.sprintpcs.com
Verizon: phonenumber@vtext.com 
Nextel: phonenumber@messaging.nextel.com
AT&T: phonenumber@txt.att.net