I took a look at your use case and customers who built a similar app use these [your-business-name] tools:
1. Messaging Copilot – SMS tool that will intelligently select the best [your-business-name] phone number to deliver your messages.
2. Lookup – API for getting information about phone numbers. You can use it to clean up your subscriber list (identify mobile vs landline numbers).
If you have a question about any of these tools, please let me know. I’m here to help.