Alltel
[10-digit phone number]@message.alltel.com
Example: 2125551212@message.alltel.com

AT&T (formerly Cingular)
[10-digit phone number]@txt.att.net
Example: 2125551212@txt.att.net

Boost Mobile
[10-digit phone number]@myboostmobile.com
Example: 2125551212@myboostmobile.com

Nextel (now part of Sprint Nextel)
[10-digit telephone number]@messaging.nextel.com
Example: 7035551234@messaging.nextel.com

Sprint PCS (now Sprint Nextel)
[10-digit phone number]@messaging.sprintpcs.com
Example: 2125551234@messaging.sprintpcs.com

T-Mobile
[10-digit phone number]@tmomail.net
Example: 4251234567@tmomail.net

Verizon
[10-digit phone number]@vtext.com
Example: 5552223333@vtext.com

Virgin Mobile USA
[10-digit phone number]@vmobl.com
Example: 5551234567@vmobl.com