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You can check if a number is using Twilio via a special number: https://www.twilio.com/en-us/blog/lookup-phone-carrier-recor....

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Or a site like https://www.freecarrierlookup.com/ which works for every number

Twilio has a concept of "hosting a number", meaning, the original carrier retains the number, only SMS is handled by Twilio. So parent's link will be more accurate for this application.

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