btw it only works for cell phones in the US. and on popular carriers... (using the email-to-sms interface the carriers provide -- for example if you send an ema

btw it only works for cell phones in the US. and on popular carriers... (using the email-to-sms interface the carriers provide -- for example if you send an email to PHONENUMBER@tmomail.net, then a sms message will be delivered to PHONENUMBER) see the lifehacker link that sam odio provides above.