Thanks to our friends from M2M Connectivity for highlighting this useful tip in a recent newsletter:
Using the RB411U/UHR RouterBoard to send and receive SMS
The RouterBoard (RB411U/RB411UHR) can be used to send and receive SMS through 3G modem by issuing some AT commands.
RouterOS lists such modems as serial port that appears in '/port print' listing. The following command can be issued to send SMS:
/tool sms send port=port dst-smsc=smsc message=message
/tool sms send port=usb3 "04XXXXXXX" message="HELLO ALL"
SMS received by the RouterBoard can be read by following commad
/tool sms print
Find out more about this cool feature at the official routerOS wiki.