How to send SMS message
Everyone knows how to send SMS message using mobile device, but this task could be challenging for a software developer.
Basically is required to have a connection to SMSC or SMS gateway, and following pricing list at clickatell.com it is clear that direct account could be costly (0.07$ per message). From the other side it allows to use Kannel – an open source WAP and SMS gateway.
Next idea is to use carrier service. Most SMS service providers and wireless carriers very often support one or more of the following protocols/interfaces: HTTP, HTTPS (HTTP + SSL encryption), XML over HTTP / HTTPS, SMTP (email to SMS), FTP.