You have Phone# A in country X that cannot roam outside the country, but can send unlimited international SMS. And you have Phone# B in country Y. You are leaving country X for a while and want to know if you get a Call on Phone#A. Set this up in advance on a spare phone in country X and have someone keep the phone alive and online.
If
Any incoming phone call missed
This Trigger fires every time you miss a phone call on your Android device.
Then
Send an SMS
This Action will send an SMS from your Android device to any phone number you specify.
Explore more great ways to automate MUNCNSTU and Android SMS