I’m attempting to create a config that will allow me to reboot a router remotely via SMS.
So far so good, I’m receiving SMS’s and I have a script (below) that I intend to modify to do the reboot part for me.
(This script: http://forum.mikrotik.com/t/script-on-rb411u-to-check-credit-on-3g-connection/55847/1 )
BUT
I have this problem.
My ppp (3G) data connection seems to be hogging the channel for itself. I have 5 available ports, 0 through 4.
( Using a sierra card, not USB modem )
My 3G connections works only if my ppp-out1 Data Channel = 3.
And, my incoming SMS’s are only visible in my SMS Inbox if my SMS config is set to use Channel 3.
So both need to use channel 3. 
I cannot activate my SMS’s receive-enabled when my ppp-out1 is enabled and vice versa, I get an error stating: “could not acquire serial port”
Temporarily disabling my 3G (ppp) connection in order to scan for new SMS’s is not an option as the 3G connection is a mission-critical interface.
I know my cellphone can send/receive data & SMS simultaneously with this SIM, so the problem is not with the SIM card.
Any ideas?