I required an SMS gateway to send 1-15 non critical SMS messages a day and produced this hack API to the Vodafone Web2TXT system. (You need a Vodafone.net.nz login to be able to use this.) Messages from this will be from your cellphone number so it makes it handy if you need to reply.
Perl, using LWP/SSL and a few tricks, performs the appropriate POST requests to use the Web2TXT system to send the recipient's cellphone an SMS.
http://www.cpan.org/authors/id/G/GA/GAAS/libwww-perl-5.76.tar.gz)
Net_SSLeay (http://www.cpan.org/authors/id/S/SA/SAMPO/Net_SSLeay.pm-1.25.tar.gz)
IO-Socket-SSL (http://www.cpan.org/authors/id/B/BE/BEHROOZI/IO-Socket-SSL-0.95.tar.gz)
Crypt-SSLeay (http://www.cpan.org/authors/id/C/CH/CHAMAS/Crypt-SSLeay-0.51.tar.gz)3 pages link to CommandLineSMS:
