Step-by-step process to configure SMS 

Follow the below steps to send SMS seamlessly-

i) Sender ID Approval (Some countries have specific rules and regulations for Sender ID) -

To send SMS globally - Follow sender ID rules for different countries
#Note - For Indian companies to send SMS in India - Follow DLT guide

ii) Template (To keep your communication secure, spam free, and easy to edit anytime)

Create a Flow for transactional SMS - Follow its quick process

#Note - If you are implementing OTP/Phone verification then use its dedicated service i.e. SendOTP - Follow its doc here