You can send SMS to cell phone using email.
If you can send email, you can send SMS.
Just send email to your cell phone company special email address.

Cell phone companies in the United States:

AT&T	phonenumber@mms.att.net
Verizon	phonenumber@vtext.com
T-Mobile	phonenumber@tmomail.net
Sprint	phonenumber@messaging.sprintpcs.com
Nextel	phonenumber@messaging.nextel.com
Virgin Mobile	phonenumber@vmobl.com
Alltel	phonenumber@message.alltel.com
SunCom	phonenumber@tms.suncom.com
VoiceStream	phonenumber@voicestream.net

phonenumber = your 10 digit phone number

Example: 2125324430@mms.att.net

Ask your cell phone company if it is not listed here.
Tell us to add your company to our list.

Email sent to cell phones is billed to the subscriber as a text message.