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Is the question how to write a trigger or how to send a SMS from within Cache/IRIS? 

You should be able to find how to do both things in the Intersystems documentation (link not working for me right now).

There are two parts to it.

1. Create a trigger after INSERT/UPDATE/DELETE. Triggers can work for both sql and object access:

Trigger NewTrigger1 [ Event = INSERT/UPDATE/DELETE, Foreach = row/object, Language = objectscript, Time = AFTER ]
{
    set ^dbg={fieldname*N}
}

2. In the trigger code send an SMS. You can either use an API (a lot of them available) or talk to a GSM modem.