SMS is a great way to get email messages on your phone. Most carriers have “SMS gateways” which take email messages from the Internet and deliver them to their customers’ cell phones as SMS text messages.
Source: http://www.email-unlimited.com/stuff/send-email-to-phone.htm
Alltel
[10-digit phone number]@message.alltel.com
Example: 2125552555@message.alltel.co
AT&T Wireless (now part of Cingular)
[10-digit phone number]@mmode.com
Example: 2125552555@mmode.com
Boost Mobile
[10-digit phone number]@myboostmobile.com
Example: 2125552555@myboostmobile.com
Cingular
[10-digit phone number]@mobile.mycingular.com OR
[10-digit number]@cingularme.com
Example: 4152555555@cingularme.com
Nextel (now part of Sprint Nextel)
[10-digit telephone number]@messaging.nextel.com
Example: 7035552555@messaging.nextel.com
Sprint PCS (now Sprint Nextel)
[10-digit phone number]@messaging.sprintpcs.com
Example: 2125552555@messaging.sprintpcs.com
T-Mobile
[10-digit phone number]@tmomail.net
Example: 4252555555@tmomail.net
Verizon
[10-digit phone number]@vtext.com
Example: 555255555@vtext.com
Virgin Mobile USA
[10-digit phone number]@vmobl.com
Example: 5552555555@vmobl.com