Hi,
Hm-m-m... Documentation does not mention any prerequisite...
I think that you should ask Support directly via the https://support.smartbear.com/message/?prod=TestComplete form and I will appreciate it if you update this thread with their reply.
P.S. Additionally, you may consider https://stackoverflow.com/questions/26311243/sending-sms-programmatically-without-opening-message-ap... thread.
Regards,
/Alex [Community Hero]
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