there are a couple of ways first you have to find out the email address
of the cellphon provider
(t-mobile, cinglair,verizon, sprint,etc
then you would address to
the 10digtnumber @ cellphone.net
(like t-moble is
3101234567@tmomail.net
here are some cellphone providers you do have to know the carrier of
the cellphone you want to send email to:
AT&T: AreaCode+Mobile@mobile.att.net
Verizon: AreaCode+Mobile@vtext.com
Nextel: AreaCode+Mobile@page.nextel.com
T-Mobile: AreaCode+Mobile@tmomail.com
Sprint: AreaCode+Mobile@messaging.sprintpcs.com
Cingular: 1+AreaCode+Mobile@mobile.mycingular.com
or you can try
1112223333@teleflip.com
that way you dont have to know the provdier email address. it works too
(I just tried with my cellphone)
or another route is via
sms gateways