1. folder
/home/USER/domoticz/scripts/

2. file
sendsms.sh

#!/bin/bash

# Write ./sendsms.sh MESSAGE
# Phone numbers separated by a space
PHONE="22222222222 3333333333 4444444444"

for p in $PHONE
do
echo $1 | gammu sendsms TEXT $p -unicode
done
exit 0

3. Events
10.png

P.S. if u wana check ...