Do you mean using osmocom or not?
If not the answer is a bit OT, but you can do it easily using AT commands that almost every phone support.
Have a look at the command AT+CSMP.

On Mon, May 14, 2012 at 3:27 PM, Chengcheng Gou <gouchengcheng@gmail.com> wrote:
I want to study the Slient SMS, How can it be constructed? Anyone kowns?