Certainly in the US, the Assist with Bluetooth option (made for BMW by Motorola) does not support SMS messaging. This module only include VR for Phone only.

The fact you had it in your M3, maybe because you had the Bluetooth only module. This module, made for BMW by Visteon does support SMS (after a certain generation) with an appropriate handset. This module also includes VR commands for Phone, NAV and notepad (again for US based cars).