Send Text messages for Free
Cingular (your 10 digit mobile number)@cingularme.com
Nextel (your 10 digit mobile number)@messaging.nextel.com
Sprint (your 10 digit mobile number)@messaging.sprintpcs.com
T-Mobile (your 10 digit mobile number)@tmomail.net
Verizon (your 10 digit mobile number)@vtext.com or @vzwpix.com
Virgin Mobile (your 10 digit mobile number)@vmobl.com
its free to send, if the reciever has a text package, they just deduct from that.
there is also a service by Teleflip.com that allows you to send a text message to any US number for free by sending an email to [email protected], (ex. [email protected]). Its Free for upto 5000 messages a month.