Depends how your SMS service will accept alerts.
There is a couple of options i can think off. Can send an email to the service on particular alerts (by default may be bigger than what is allowed in SMS), or SNMP trap.
Can send an email to vRO which then parses it and sends another email to the SMS server or rest call to the service. with vRO in the middle most things can be done.
Cheers
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VCDX #201
Author of Mastering vRealize Operations Manager