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You can find more information about question node in the below video:
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Common Errors in SMS Channel
SMS message isn’t delivered
If you have using Twilio for the SMS channel, and you find that the message isn’t deliveried.
You can follow the below checklist:
Check error log in UChat
Check error log in Twilio
Make sure Geo-permission is enabled in your Twilio account
Sometimes, you need to enable the Geo-Permission in your Twilio account, you need to select the regions and countries you will allow to send the message.
Please find more details about how to send international SMS message & enable geo-permission in your Twilio account:
https://support.twilio.com/hc/en-us/articles/223181108-How-International-SMS-Permissions-work