It appears that chan_dongle can do it, but you have to use the CLI, rather than Message(), and chan_dongle is third party supported: Send SMS form chan_dongle module
Otherwise you can shell out to a command that uses a commercial SMS gateway.
It appears that chan_dongle can do it, but you have to use the CLI, rather than Message(), and chan_dongle is third party supported: Send SMS form chan_dongle module
Otherwise you can shell out to a command that uses a commercial SMS gateway.