It seems no one uses their PDA to send SMS via their cell phone. If anyone does, they use a BT phone (my cell phone is not BT enabled). I've posted before asking about SMS through Gomadic cables and never received any responses. But I guess it is understandable considering Gomadic had no clue either.
I just wish I could type text on anything other than a number pad.
Just noticed you use the x51V. I use the x50V. Same stuff applies though.