To prevent "SOQL queries: 101 limit error" errors when trying to send SMS messages using a flow with the Apex Class, we created a new flow called Blackthorn Messaging Send Message(Flow).
Flow Configuration
Entry Criteria Defined on Account Object
Get a Contact Record from the Account
Looping the Process to Handle Contacts
Define the Variables to get Data from the Contact Record
Recipient Variable
Collect Contact Records into a Collection Variable
Call the Apex Method to Send SMS to the Valid Contact Records
